AD 51-09-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | Wasp Major B5 | PRATT & WHITNEY Model Wasp Major TSB3-G or B5 Engines |
| engine | Pratt & Whitney Division | Wasp Major TSB3-G | PRATT & WHITNEY Model Wasp Major TSB3-G or B5 Engines |
Unsafe Condition
Engines may fail to develop the selected takeoff power, leading to insufficient performance for transport category requirements.
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Required Actions
Operators must select and maintain a takeoff power level, reduce fleet operating weights if power is insufficient, measure engine power at specified intervals (installation of overhauled engines, No. 3 inspections near midpoint and end of service time between overhauls), and submit results to FAA. Power restoration, engine replacement, or weight reduction is required if power falls below selected value.
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Compliance Time
as soon as possible but not later than May 1, 1951
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Affected Aircraft
Boeing Model 377 Aircraft equipped with Pratt & Whitney Model Wasp Major TSB3-G or B5 engines using Antidetonate (Wet Power) for takeoff.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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