AD 72-23-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | British Aerospace Regional Aircraft | H.P. 137 Jetstream Mk. 1 | Airworthiness Directives; Handley Page (Jetstream Aircraft LTD) HP-137 Mark I Airplanes |
Unsafe Condition
Engine rotor failures and combustion chamber burn through torching flames could allow fires in the nacelle forward of the existing vertical firewall to enter the area aft of the firewall, damaging wing structure or burning into the wing fuel tank.
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Required Actions
Install additional fire shielding to the lower nacelle area down from and aft of the existing vertical firewall using fireproof materials compliant with FAR 23.1191, following Jetstream Aircraft Limited Modification No. 5001 or an equivalent approved modification.
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Compliance Time
on or before March 24, 1973, unless already accomplished, except that the airplane may be flown in accordance with FAR Section 21.197 and 21.199 to a base where the alteration can be performed
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Affected Aircraft
Handley Page (Jetstream Aircraft LTD) HP-137 Mark I airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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