AD 99-08-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
Unsafe Condition
Potential failures within the electrical motor assembly of the APU fuel boost pump, which could result in fuel leakage from the electrical connector or electrical arcing across the connector pins of the pump, and consequent fuel fire.
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Required Actions
Replace the auxiliary power unit (APU) fuel boost pump with a serviceable pump as specified in Boeing Service Bulletin 747-28A2209, Revision 1. The replacement pump must be either a reworked Lear Romec pump or a pump manufactured by another supplier.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 747 series airplanes, line positions 001 through 1150 inclusive, equipped with an APU fuel boost pump manufactured by Lear Romec with part number RR24640B.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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