AD 49-09-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sierra Hotel Aero, Inc. | Navion (Army L-17A) | Airworthiness Directives; Navion Airplanes Equipped with Adel Electric Booster Pumps |
| aircraft | Sierra Hotel Aero, Inc. | Navion A (Army L-17B and L-17C) | Airworthiness Directives; Navion Airplanes Equipped with Adel Electric Booster Pumps |
Unsafe Condition
Air leakage into the fuel system through a 0.062-inch diameter hole in the plate at the rear of the Adel pump inlet chamber, which was originally intended to prevent overboard drainage of fuel through a faulty pump shaft seal while the pump was running.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Block the 0.062-inch hole at the rear of the pump inlet chamber with an Adel manufactured wire plug. Pumps with serial numbers below 1600 without an 'R' suffix also require replacement of the pumpshaft running seal spring.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
as soon as possible but not later than April 1, 1949
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Affected Aircraft
Navion (Army L-17A) and Navion A (Army L-17B and L-17C) airplanes equipped with Adel Electric Booster Pumps, excluding pumps with serial numbers above 2451, pumps with a red painted band on the housing, or pumps with 'G' or 'S' suffixes to the serial number.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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