AD 2020-07-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
The existing bond path design provides insufficient bond resistance margin between the fuel pump motor/impeller and structure.
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Required Actions
Replacement of the bonding jumpers on the auxiliary power unit (APU) fuel pump, installation of a second bonding jumper, inspection of the override/jettison fuel pumps and transfer/jettison fuel pumps to determine if the bonding jumper has a one-piece braid or two-piece braid, and replacement of the bonding jumper if necessary, and replacement of the bonding jumper on the electrical scavenge fuel pump.
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Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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