AD 70-15-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | British Aerospace Regional Aircraft | H.P. 137 Jetstream Mk. 1 | Airworthiness Directives; Handley Page Model HP-137 Mark I Airplanes |
Unsafe Condition
Inflight failure of the first stage engine turbine disc and subsequent rupture of fuel and hydraulic lines.
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Required Actions
Relocate fuel and hydraulic shutoff valves from engine nacelles to front spar inboard of nacelle per approved modification. Remove and replace first stage turbine discs (P/N 0.261.25.013.0) before specified time/cycles, depending on engine modifications.
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Compliance Time
Before further flight (valve relocation). Before accumulation of 400 hours total disc time or 1,000 cycles (disc replacement for unmodified engines). Before accumulation of 750 hours total disc time or 2,000 cycles (disc replacement for modified engines).
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Affected Aircraft
Handley Page Model HP-137 Mark I airplanes with Turbomeca Astazou XIV series engines installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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