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Product

Auxilary Power Units (ME) (10)

Engine Accessories (ME) (1)

ATA Chapter

49 - Auxilliary Power Unit (3)

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Product Reliability Updates

You must be signed in to access this content.B737, A320, APU 131-9 A/B, Fuel Flow Divider TEE Inspection

Product Group: Auxilary Power Units (ME)

Problem: We couldn't find component maintenance manual for part number 3883830-1,-2 on the Honeywell website Can you please assist with maintenance info for this fuel flow divider?

You must be signed in to access this content.Multiple Aircraft, valves PN 3880140-1, 3880140-3 & 3880140-4 - not interchangeable

Product Group: Engine Accessories (ME)

Problem: Are the following valves interchangeable: PN 3880140-1, 3880140-3 & 3880140-4?

You must be signed in to access this content.A330/A340-200/-300 and A330NEO APU 331-350 Material of Flexible Surge Duct And Insulation Blanket

Product Group: Auxilary Power Units (ME)

Problem: What is the material of Flexible Surge Duct and Duct Insulation blanket of 331-350 Series APU

You must be signed in to access this content.Multiple Platform 36-300A and 331-500 APU Pressure Delta P Switch PN 304300-1 and -2 Interchangeability

Product Group: Auxilary Power Units (ME)

Problem: SB 3880190-49-7288 modified NHA Lube Pump 3880190-11 to become PN 3880190-13 and installed Delta P Switch PN 304300-1
SB 3881000-49-01 modified NHA Lube Module PN 3881000-6 to become PN 388100-7 and installed Delta P Switch PN 304300-2

Does the delta P switch PN 304300-1 and PN 304300-2 have different pressure set point? Or, are these interchangeable (form, fit, function)?

You must be signed in to access this content.36-150RJ APU Lubrication Module Housing Part Number

Product Group: Auxilary Power Units (ME)

Problem: What is the part number for the Housing for Lube Module part number 3881130-2 on 36-150RJ APU?

You must be signed in to access this content.A330/A340-200/-300 and A330NEO APU 331-350 Surge Duct Shelf Life

Product Group: Auxilary Power Units (ME)

Problem: What is the shelf life of the 331-350 APU surge control valve flex duct P/M 3885032-2?

You must be signed in to access this content.B737NG APU 131-9B APU Speed Droop Message 49-07950

Product Group: Auxilary Power Units (ME)

Problem: APU Speed Droop message 49-07950 persists after Boeing FIM completion and replacement of the following LRU's:
FCU, Inlet Temperature Sensor, Fuel Manifolds, APU ECU.
What can be be the cause of this issue?

You must be signed in to access this content.B737 APU 131-9B P/N 3800702-1 Bleed Pressure Fluctuations

Product Group: Auxilary Power Units (ME)

Problem: The APU can be started and is capable run one Air Conditioning Pack in AUTO position. When the Air Conditioning Packs are selected to Hi or when Main Engine Start is accomplished, wide APU bleed pressure fluctuations occur (0 to 36 PSI) associated with RPM, EGT, IGV fluctuations. SEE VIDEO ATTACHED.
APU TEST indicates NO FAULT.
The following components have already been replaced but problem persists

1. Bleed valve
2. Surge Control Valve
3. Delta Pressure and Total Pressure sensor
4. IGV actuator
5. ECU
6. APU harness inspected found OK
Please support to resolve this issue.

You must be signed in to access this content.A330/A340-200/-300 and A330NEO APU 331-350 Flexible Surge Duct

Product Group: Auxilary Power Units (ME)

Problem: What is the fleet experience/removal data/reliability of the post 331-350C APU SB 49-7590 Flexible Surge Duct, P/N 3885032-2 and are there any plans to investigate failed units?

You must be signed in to access this content.737NG - APU 131-9B - 131-9B - APU Fuel Flow Divider

Product Group: Auxilary Power Units (ME)

Problem: What can be done about seized threads of the 'B' Nut?

You must be signed in to access this content.G450 36-150GIV APU Quick Reference Technical Sheet

Product Group: Auxilary Power Units (ME)

Problem: Is there a quick reference technical sheet for the 150GIV?

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