AD 2011-13-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Model DHC-8-400 Series Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Bombardier, Inc. Model DHC-8-400 Series Airplanes |
Unsafe Condition
Non-compliances in the fuel system identified during a system safety review against Chapter 525 of the Airworthiness Manual could result in potential ignition sources within the fuel system.
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Required Actions
Replace certain fittings, couplings, o-rings, gaskets, fuel adapter, and other components with improved parts; apply Alodine 1132 to certain areas; replace a doubler on the front wing spar; add new wiring with protective sleeving; rework existing wiring; label and separate fuel quantity indicating (FQI) and high level sensor wiring; enhance electromagnetic interference (EMI) shielding; install additional provisions for wiring clips; rework contact areas for adequate electrical bonding; install spiral wrap on cable assemblies; apply a dome seal on thread openings; install fuel grommets; inspect and apply sealant to high level sensor terminal block screws.
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Compliance Time
Within 6,000 flight hours after the effective date
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Affected Aircraft
Bombardier, Inc. Model DHC-8-400, -401, and -402 airplanes, certificated in any category; with serial numbers (S/N) 4003, 4004, 4006, and 4008 through 4205 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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