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Frequently asked questions

727 | 737 | 747-767 | MD-11 | DC-10 | Airbus | BAe | Embraer | Fokker

727

Q. What are the Service Bulletins for 727 Aircraft?

A.
1011-26-18 Modifies P/N 1011B to P/N 1011C to prevent transient voltage damage
26-01 Modifies P/N 1011 to P/N 1011A
26-03 Modifies P/N 1011A to P/N 1011B
26-04 and 26-06 P/N 1050 Fire Detector Teflon Repair and Inspection
26-05A Modifies P/N 1014 to P/N 1014A (New Style Battery)
26-12 Modifies P/N 1011B to P/N 1011B-1 to add capacitor to filter transient voltages
26-17 Modifies P/N 3014 to P/N 3014A
801-26-13 Repairs Kapton Wrap
801-26-14 Installs Fire Detector P/N 3001-08 to replace P/N 1050 in the 727 APU
801-26-40 Installs MSS Fire Detection System to replace Graviner System on 727-223 under STC Top Drawing 7550


Q. What are the current part numbers for the fire detection system on the 727 aircraft?

A.
Lower engine fire detectors P/N 1825-1 and P/N 1825-2
AC operating power unit P/N 1011C
Engine #1 and #3 firewall detector P/N 1050-800/375-10
Engine #2 firewall detector P/N 1050-800/375-25
APU detector P/N 1050-800/375-6
APU detector P/N 3001-08 (STC Service Bulletin 801-26-14)
APU DC operating power unit P/N 1014A
APU coupling unit P/N 3014A(For use with P/N 3001-08)


Q. Are P/N 1825-1 or 1825-2 the same as P/N 1825-01 and 1825-02?

A. Yes, the individual units are marked as (-1) and (-2). However, the shipper and invoice will reflect (-01) and (-02) to facilitate computer software.


Q. Are P/N 1825-1 and 1825-2 interchangeable?

A. No, the detector support tubes on P/N 1825-1 and 1825-2 are configured differently. However, the 1825-1 can be reconfigured to a 1825-2 at the factory for a nominal charge.


Q. What is the Service Bulletin number that upgrades a P/N 1011B to a 1011C?

A. Service Bulletin No. 1011-26-18


Q. Are P/N 1014A and P/N 3014A interchangeable?

A. No, the 1014A is for use with the P/N 1050 detector and the 3014A is for use with the P/N 3001-08 detector.


Q. What is the part number for the tail connector assembly for P/N 1825-(X) and P/N 1050A/B detectors?

A. P/N 1039-(X)is used on P/N 1050 detectors and P/N 1625-(X) for P/N 1825-(X) detectors. Dash numbers for the P/N 1039 and 1625 tail connector assemblies are determined by the type of aircraft interface wire.



727-223

Q. What are the current part numbers for the fire detection system on the 727-223 aircraft?

A.
Engine fire detector assembly P/N 7370-01 (STC Service Bulletin 801-26-40)
Engine firewall detector P/N 3101-13
Engine firewall detector P/N 3101-14
Fire detection control unit P/N 7380-01
APU detector P/N 1050-800/375-6
APU detector P/N 3001-08 (STC Service Bulletin 801-26-14)
APU DC operating power unit P/N 1014A
APU coupling unit P/N 3014A (for use with P/N 3001-08)


Q. Is P/N 7380 control unit interchangeable with P/N 7380-01?

A. Yes, in airline service, some P/N 7380 control modules experienced Q1 transistor failures when their fire light output circuits were inadvertently shorted to ground. P/N 7380-01 adds a resistor (R29) to limit the current flow to avoid failure of Q1.


Q. During the fire detection system test, the fire warning light is dimly lit. Is this normal?

A. With P/N 7380-01 FDCU installed during the system test, the fire light -- during test only -- will appear dimmer than normal. The fire light will be normal brightness with a true fire warning.



737

Q. What are the Service Bulletins for 737 Aircraft?

A.
801-26-13 Repairs Kapton Wrap on P/N's 1704, 1705, 1706, 1708, and 1714 detector assemblies.
801-26-25 Optional replacement of P/N 1705 with P/N 1705-1 fire detector assembly.
801-26-26 Repairs PCB P/N 5389 in FDCU P/N 5394 S/N 202-204,206,208,209, and 212-215 only.
801-26-28 Modifies P/N 5394 FDCU to P/N 5394-01. Effective with S/N 210 thru 259.
801-26-31 Modifies P/N 5394-01 FDCU to P/N 5394-02 by adding current inrush suppressor to PCB 5386.
801-26-36 Installs Meggitt Safety Systems Fire Detection System to replace Kidde Fire Detection System on 737-100/-200/-200C aircraft. STC Dwg 7060.
801-26-38 Installs spiral wrap to prevent detector chafing against 1/4 inch tube.
801-26-47 Modifies P/N 6594 FDCU to P/N 6594-01. Identifies latent failure mode. Effected S/N's 201-619.
801-26-62 Modifies P/N 901950-01 FDCU to P/N 901950-02 by replacing rear panel.


737-100/200

Q. What are the part numbers for the fire detection system on the 737-100 and 737-200 aircraft?

A.
Engine #1 upper detector P/N 1704
Engine #2 upper detector P/N 1708
Engine #1 and #2 lower detector P/N 1705 and P/N 1705-1(STC S/B 801-26-25)
Reverser P/N 1714
APU muffler detector P/N 1703
APU detector P/N 1706
APU tailpipe P/N 1709
Fire detection control unit P/N 1707C



737-200 (Advanced)

Q. What are the part numbers for the fire detection system on the 737-200 Advanced aircraft?

A.
Engine #1 upper LHS P/N 5404
Engine #1 and #2 lower, CSD 40 AGB P/N 5405
Engine #2 upper RHS-5404, Engine #1 and #2 lower, CSD 60 AGB P/N 5407
APU muffler detector P/N 5401
APU detector P/N 5402
APU (heatshield) P/N 5403
Fire detection control unit P/N 5394-02



737-300/400/500

Q. What are the part numbers for the Fire Detection System on the 737-300/-400/-500 aircraft?

A.
Fan upper RHS P/N 6672-01
Fan upper LHS P/N 6674
Fan lower P/N 6676
Core P/N 6678
APU muffler detector P/N 5401
APU detector P/N 5402
APU (heatshield) P/N 5403
Fire detection control unit P/N 6594-01


Q. When flying single loop operation (MEL) on my 737-300/-400/-500 aircraft, I get a "Fire Warning" light during take-off and climb. What is the cause?

A. The most probable cause is a failed detector in the core assembly (P/N 6678). Detectors manufactured prior to 1996 can experience a driftdown of the average alarm temperature, causing the detector to give an alarm condition at a temperature substantially lower that its original calibrated value. Remove and replace the core detector assembly and conduct the "Overheat" average alarm temperature test IAW applicable CMM.


Q. We have been having problems with the core assembly mating connector deteriorating and causing a fire detection system fault condition on our 737-300/-400/-500 aircraft. What is the cause?

A. The high temp, high vibration environment in the core section has caused the mating connector on the core fire/overheat detectors to deteriorate over time. Hi-Rel connector (P/N 44267KS-14S-5SX-924) has been developed to resolve this issue. Boeing has released revised Service Information Letter 737-SL-26-020-A which allows the use of this connector as the preferred alternate part. Contact Hi-Rel Connector Inc. directly to purchase this connector.


737-600/-700/-800/-900

Q. What are the part numbers for the fire detection system on the 737-600/-700/-800/-900 aircraft?

A.
Propulsion P/N 902018-01
Core Aft Left P/N 902862
Fan Lower P/N 902016-01
Fan Upper P/N 902864
APU Lower P/N 902014-01
APU Upper P/N 902013-01
APU Exhaust P/N 902020-01
Fire Detection Control Unit P/N 901950-02


Q. I am getting intermittent "Fault" conditions on the fire detection system on my 737NG aircraft and the fault isolation system points to the "Upper Fan" detector assembly as the source of the fault. However, the "Upper Fan" assembly always checks good. Any suggestions for troubleshooting?

A. Inspect the left and right hand core detector harness assemblies for possible wire damage where the detector terminal lug attaches to the individual Core Fire Detector. Refer to CFMI fire detector harness Service Bulletins CFMI S/B 72-0136, S/B 72-0258 and S/B 72-0269 for recommended repair actions.


Q. Does Meggitt Safety Systems have any solutions or recommendations to improve the reliability of the core fire detector cable harness for the 737NG?

A. Meggitt Safety Systems has developed a cable harness technology that is specifically designed to operate and survive in the harsh environment of the core section of the engine. A major 737NG operator is currently replacing the OEM-installed organic cable harness assembly with the Meggitt Safety Systems SiO2 high temperature technology cable on an attrition basis, as a preferred spare. Refer to Boeing Service Bulletin 737-26-1123, dated 18 January 2005, or later, and Meggitt Safety Systems Service Bulletin 26-35, Revision F or later, for more details.



747-400 and 767

Q. What are the Service Bulletins for 747-400 and 767 Aircraft?

A.
801-26-46 Move fire detection loop identification etching on detector assemblies.
801-26-48 Modifies P/N 8193 to P/N 8193-01. Moves clamp to permit installation on new GE engines with Active Clr Control System.
801-26-55 Modifies qty 8 P/N 8193-01 and P/N 8194 detector assemblies for KLM/Boeing Service Evaluation.
801-26-56 Modifies P/N 7883, 7884, 8194 and 8193-01 assemblies to high temperature version, replacing P/N 7101-08 and -09 detectors with P/N 7101-65 detectors.
801-26-57 Modifies P/N 901084 to P/N 901561, replacing P/N 7101-06 detector with P/N 7101-61 high temperature detector. Modifies P/N 901085 to P/N 901560, replacing P/N 7101-11 detector with P/N 7101-62 high temperature detector.
801-26-60 Modifies P/N 901905 and P/N 901906, replacing P/N 7101-65 detectors with P/N 7101-265 detectors on CF6-80C2F engines.
801-26-61 Modifies Model 801-DRH Detector (P/N 3601-XX) assemblies to 801-RDS Detector (P/N 7101-XX) assemblies on PW JT9D powered 767-200 aircraft.
26-32 Replaces existing organic engine fire detector wiring on CF6-80C2F powered 747-400 aircraft with Meggitt Safety Systems SiO2 High Temperature cables.


Q. What are the part numbers for the fire detection system on the 747-400 and 767 aircraft?

A.
For G.E. CF6-80C2F engines
Lower forward P/N 7882
Upper forward P/N 901560
Upper aft P/N 901906
Lower aft P/N 901907
Fire detection control card P/N 6445-01
For P.W. 4000 engines
Upper forward P/N 8242
Lower aft P/N 8243
Upper aft P/N 8244
Lower forward P/N 8241-01
Fire detection control card P/N 6445-01
APU lower P/N 8061
APU upper P/N 8062


Q. Do I need to change out the P/N 7101-65 detectors in the upper and lower aft positions and replace with 7101-265 detectors on my CF6-80C2F engine installation on my 747-400 and 767 aircraft?

A. Yes, the P/N 7101-65 detectors can experience an insulation resistance problem that can cause an intermittent fault condition to be displayed. The 7101-265 detector corrects this problem. Please refer to Service Bulletin 801-26-60.


Q. My 747-400 fleet with PW 4000 engines has been operating virtually trouble free for 10+ years, but now we are experiencing intermittent single loop faults that occur during the take off and climb portion of the flight profile. We have been trying to troubleshoot the fire detection system with little success of locating the fault. Is there anything I can do to isolate this condition?

A. Yes, inspect the upper and lower aft detectors to insure that the manufacturing dates are after 1997 and that the detector serial number is higher than 50,000. Detectors with a serial number below 50,000 can experience what is called a "high temperature driftdown" over time with the affect of the average alarm temperature coming on very low out of tolerance. Suspect detectors should be removed from the engine and tested in accordance with the average alarm temperature test, the shortened "Go - No Go" test called out in CMM 26-10-65, or returned to Meggitt Safety Systems for test and evaluation.



MD-11

Q. What are the Service Bulletins for MD-11 Aircraft?

A.
801-26-49 Recalls Fire Detection Control Units for upgrade to P/N 8038-02-02.
801-26-50 Modifies loop board assembly P/N 8334-02 to Nod 1 configuration.
801-26-52 Modifies P/N 8038-02-02 to P/N 8038-02-03 (FDCU software revision).
801-26-58 Modifies P/N 8038-02-03 to P/N 8038-03-03, by modifying loop board assembly P/N 8334-02 to P/N 8334-03.
801-26-59 Replaces P/N 7101-136 and -137 detectors with 7101-236 and -237 detectors for CF6-80C2 engines.
26-30 Replaces existing organic engine fire detector wiring on CF6-80C2 powered MD-11 aircraft with Meggitt Safety Systems SiO2 High Temperature cables.


Q. What are the part numbers for the fire detection system on the MD-11 aircraft?

A. Meggitt Safety Systems provides the fire detectors only for MD-11. The EBU is accomplished by Goodrich Aerostructures (Chula Vista, CA) who installs the detectors onto a support tube assembly.
For G.E. CF6-80C2 engines
Lower Turbine P/N 7101-135
Upper Turbine Rt P/N 7101-236
Upper Turbine Lt P/N 7101-237
Accessory Gearbox P/N 7101-38
For PW 4000 engines
Thrust Reverser Door RHS P/N 7101-13
Thrust Reverser Door LH P/N 7101-12
Pylon P/N 7101-129
APU Forward P/N 7101-19
APU Right P/N 7101-20
APU Left P/N 7101-21
Fire Detection Control Unit P/N 8038-03-03


Q. Do I need to change out the P/N 7101-136 and -137 detectors in the upper and lower turbine positions and replace with 7101-236 and -237 detectors on my CF6-80C2 engine installation on my MD-11?

A. Yes, the P/N 7101-136 and -137 detectors can experience an insulation resistance problem that can cause an intermittent fault condition to be displayed. The 7101-236 and -237 detectors correct this problem. Please refer to Service Bulletin 801-26-59.


Q. We have heard of a new high temperature cable technology that's available from Meggitt Safety Systems for MD-11 aircraft fire detection system with CF6-80C2 engines. What information is available? Have any operators installed this cable system, and if so, what has been its success?

A. Meggitt Safety Systems has developed a cable technology that replaces existing organic engine fire detector wiring on CF6-80C2 powered MD-11 aircraft with SiO2 High Temperature cables. FedEx, a major operator of MD-11 aircraft, has retrofitted their entire fleet with great success. Current data reflects an MTBUR exceeding 238,000 hours. Please refer to Meggitt Safety Systems Service Bulletin 26-30 for more information.



DC-10

Q. What are the Service Bulletins for DC-10 Aircraft?

A.
601-26-02 Installs Smoke Detectors P/N 7750 under DC-10 STC Drawing 7950.
601-26-51 Modifies P/N 7750 Smoke detector to P/N 7750-02 to preclude condensation on optics.
801-26-20 Installs Meggitt Safety Systems Pneumatic Fire Detection System to replace Edison System on DC-10 under STC drawing 4050.
801-26-21 Installs Meggitt Safety Systems Pneumatic Fire Detection System intermixed with Edison System on DC-10 under STC drawing 7050.
801-26-27 Modifies P/N 3353 Fire Detection Control Unit to P/N 3353-01.


Q. What are the current part numbers for the pneumatic fire detection system on the DC-10 aircraft?

A.
Core P/N 4361
Fan P/N 4362
Pylon detector P/N 3851-01
Fire detection control unit P/N 4918 and P/N 3353-01



Airbus A300/A310

Q. What are the Service Bulletins for A300 Aircraft?

A.
801-26-22 Installs Meggitt Safety Systems Pneumatic Fire Detection System to replace Edison System on A300 under STC Drawing 8050.
801-26-23 Installs Meggitt Safety Systems Pneumatic Fire Detection System intermixed with Edison System on A300 under STC drawing 9050.


Q. What are the current part numbers for the pneumatic fire detection system on the A300 aircraft with CF6-6/-50 engines?

A.
Core P/N 4361
Fan P/N 4362
Pylon detector P/N 3851-01
Fire detection control unit P/N 4918 and P/N 3353-01


Q. What are the current part numbers for the fire detection system for A300-600 aircraft with CF6-80C2 engines?

A.
Core P/N 3601-79
Pylon P/N 3601-20
APU P/N 4550-01
Fire detector support tube assemblies are supplied by Goodrich Aerostructures.
Fire detection control unit P/N 2739-02 or P/N 901285


Q. What are the current part numbers for the fire detection system for A300 aircraft with PW JT9D-7R4 engines?

A.
Core RH P/N 5779-01
Core LH P/N 5781-01
Pylon P/N 7101-10
APU P/N 4550-01
Fire detection control unit P/N 2739-02


Q. What are the current part numbers for the fire detection system for A300-600 aircraft with PW 4000 engines?

A.
Core LH or RH P/N 3601-92
Pylon
APU P/N 4550-01
Fire detection control unit P/N 2739-02 or P/N 901285


Q. What are the current part numbers for the fire detection system for A310 aircraft with PW JT9D-7R4 engines?

A.
Core RH P/N 5779-01
Core LH P/N 5781-01
Pylon P/N 7101-10
APU P/N 4550-01
Fire detection control unit P/N 2739-02


Q. What are the current part numbers for the fire detection system for A310 aircraft with CF6-80A3 engines?

A.
Core P/N 5631
Fan P/N 6144
Pylon P/N 3601-20
APU P/N 4550-01
Fire detection control unit P/N 2739-02



Airbus A318

Q.What are the current part numbers for the fire detection system for A318 aircraft with PW 6000 engines?

A.
Fancase P/N 903546
Core P/N 903547
Pylon P/N 3601-91
APU P/N 4550-01
Fire detection control unit P/N 3720 (manufactured by L'Hotellier in France)



Airbus A319/A320/A321

Q. What are the current part numbers for the fire detection system for A319/A320 aircraft with CFM56-5A engines?

A.
Fan P/N 5421-14
Core P/N 7101-05
APU P/N 4550-01
Fire detector support tube assemblies are supplied by Goodrich Aerostructures.
Fire detection control unit P/N 3720 (manufactured by L'Hotellier in France)


Q. What are the current part numbers for the fire detection system for A320/A321 aircraft with CFM56-5B engines?

A.
Fan P/N 5421-14
Core P/N 8862-101
Fire Detector support tube assemblies are supplied by Goodrich Aerostructures.
Fire detection control unit P/N 3720 (manufactured by L'Hotellier in France)


Q. What are the current part numbers for the fire detection system for A320/ A321 aircraft with Shorts V2500 engines?

A.
For V2500 A1 Engines
Fan P/N 7702-02
Core P/N 7827-02
For V2500 A5 Engines
Fan P/N 7702-03
Core P/N 7827-02
APU P/N 4550-01
Fire Detection Control Unit P/N 3720 (manufactured by L'Hotellier in France)
Later aircraft may use the P/N 7702-04 and P/N 7827-03 fire detector assemblies. Contact factory for details.



Airbus A330

Q. What are the current part numbers for the fire detection system for A330?

A.
For CF6-80E1 engines
Gearbox P/N 7101-56
Upper turbine P/N 7101-148
Lower turbine P/N 7101-149
APU P/N 4550-01
Fire Detection Control Unit P/N 3700 or 3710 (manufactured by L'Hotellier in France)
Fire Detector support tube assemblies are supplied by Goodrich Aerostructures.
For PW 4168 engines
Core, left door P/N 900974-03
Core, right door P/N 900974-02
Fire detection control unit P/N 3700 or 3710 (manufactured by L'Hotellier in France)
For RR Trent 700 engines
Fan starboard P/N 901400-01
Fan port P/N 901403-03
IP compartment P/N 901404
Lower core P/N 901507-01
Fire detection control unit P/N 3700 or 3710 (manufactured by L'Hotellier in France)



Airbus A340

Q. What are the current part numbers for the fire detection system for A340?

A.
For CFM56-5C engines
Fan P/N 7101-53
Core P/N 7101-54
Turbine P/N 7101-155
APU P/N 4550-01
Fire detection control unit P/N 3700 or 3710 (manufactured by L'Hotellier in France)
Fire detector support tube assemblies are supplied by Goodrich Aerostructures.
For RR Trent 500 engines
Fancase starboard P/N 903467-04
Fancase port P/N 903468-06
Core exhaust P/N 903469-04
IP compressor P/N 903470-04
Fire detection control unit P/N 3700 or 3710 (manufactured by L'Hotellier in France)


Q. I have an older fleet (10 to 15 years old) of A340 aircraft and I am having problems with single loop faults during the take-off and climb portions of the flight profile that are not apparent when ground testing is accomplished. Do you have any suggestions for troubleshooting of the fire detection system?

A. Yes, inspect the turbine detectors to ensure that the manufacturing dates are after 1997 and that the detector serial number is higher than 50,000 for P/N 7101-55, or that the 7101-55 has been replaced with the improved P/N 7101-155 detector. P/N 7101-55 detectors with a serial number below 50,000 can experience what is called a "high temperature driftdown" over time with the effect of the average alarm temperature coming on very low out of tolerance. Suspect detectors should be removed from the engine and tested in accordance with the average alarm temperature test, the shortened "Go - No Go" test called out in CMM 26-10-65, or returned to Meggitt Safety Systems for test and evaluation.


Q. We have been having problems with the fire detector sensing element breaking and our claims for warranty have been repeatedly denied. Why?

A. Typically, sensor breakage is caused by either an installation problem or maintenance-induced damage that would not be covered under Meggitt Safety Systems' warranty policy. After careful review of returned detectors, we have determined that there are two main causes for this sensor breakage issue; (1) incorrect installation of the detector to the support tube, resulting in sensor overhang at the end of the support tube exceeding the 1" maximum as called out in Goodrich Aerostructure manuals, and (2) damage that is considered to be "secondary" as the result of support tube failure.



Airbus A380

Q. What are the current part numbers for the fire detection system for the A380 aircraft?

A.
For the Trent 900 engine
Zone 1 FWD P/N 904653-10
Zone 1 AFT P/N 904654-11
Zone 2 P/N 904655-10
Zone 3 P/N 904656-10
Main landing gear P/N 8919-01
Pylon P/N 8920-10
APU P/N 8918-01
For the GP 7200 engine
Cowl doors P/N 8917-04
Pylon P/N 8920-12
Fire detection control unit P/N 904662-04-32
Conversion module P/N 904631-04-30



BAe 146

Q. What are the Service Bulletins for the BAe 146 Aircraft?

A.
801-26-39 Modifies P/N 5234-01 Control Card to P/N 5232-02


Q. What are the current part numbers for the fire detection system on the BAe 146?

A.
Zone 1, door mounted P/N 3101-08
Zone 2, engine mounted P/N 3101-09
APU P/N 3101-10
Fire detection control card P/N 5234-02



Embraer 135/145/170/190

Q. What are the current part numbers for the fire detection system on EMB 135/145/170/190 aircraft?

A.
For EMB 135/145
Engine P/N 3601-133
Pylon P/N 3601-134
APU P/N 3601-135
Fire detection control unit P/N 902081
For EMB-170
Engine (assembly) P/N 904259 and P/N 904260
Engine (detector) P/N 8891-16
Pylon P/N 3601-157
APU P/N 3601-155
For EMB-190
Gearbox P/N 904805-02
Oil tank P/N 904807-02
Upper core P/N 904809-02
Lower core P/N 904811-02


Q. We have been having chafing problems with the engine fire detector sensing element which is causing excessive maintenance actions and reduced reliability of the fire detection system. Warranty claims for this failure have also been denied. Why?

A. Sensor chafing problems are typically caused by sensor contact with an adjacent surface or component and is not a manufacturing or design defect of the detector itself. This particular issue has been identified as an installation problem, and therefore should be directed back to Embraer for corrective action.



Fokker F-100

Q. What are the current part numbers for the fire detection system on the Fokker 100 aircraft?

A.
Engine P/N 8890
Fire wall P/N 7101-32
APU P/N 7101-68
APU tail P/N 7101-69
Fire detection control module P/N 900045

   
     

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