AD 76-26-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | British Aerospace Regional Aircraft | H.P. 137 Jetstream Mk. 1 | Airworthiness Directives; Scottish Aviation Limited Model HP- 137 Mk. 1 Jetstream Airplanes |
Unsafe Condition
Cracks along the lower flange of the end rib and rib doubler at the outer end of each outer wing flap could lead to flap separation and possible loss of airplane control.
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Required Actions
Visually inspect the outer end of each outer wing flap using a magnifying glass with at least 5 power per Service Bulletin 9/5, issue 2. Radiographically inspect the same area per Service Bulletin 9/5, issue 2. Replace cracked parts with serviceable parts of the same part number.
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Compliance Time
Before further flight (with exceptions for flights to a base where work can be performed with flaps fully retracted) and at intervals not to exceed 50 landings for visual inspections, and within the next 50 landings followed by intervals not to exceed 500 landings for radiographic inspections. Compliance may be discontinued after installing Modification No. 5111.
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Affected Aircraft
Scottish Aviation Limited Model HP-137 Mk. 1 Jetstream airplanes except those with Modification No. 5111.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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