AD 49-11-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sierra Hotel Aero, Inc. | Navion (Army L-17A) | Airworthiness Directives; Navion Airplanes Equipped With Carter Fuel Pumps Continental P/N 530509 (Carter M687-S and M688-S) or Continental P/N 50375 |
| aircraft | Sierra Hotel Aero, Inc. | Navion A (Army L-17B and L-17C) | Airworthiness Directives; Navion Airplanes Equipped With Carter Fuel Pumps Continental P/N 530509 (Carter M687-S and M688-S) or Continental P/N 50375 |
Unsafe Condition
Carter fuel pump lower diaphragm failures caused by diaphragm deterioration due to excessive pump temperatures when pumps are run dry.
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Required Actions
Convert parallel Carter pump fuel systems to series pump arrangement or install an approved Ryan fuel system with Adel electric booster pump or equivalent approved fuel system. Continue daily inspections for looseness of the pump lower bowl as specified in Ryan's Bulletin No. 7.
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Compliance Time
as soon as possible but not later than April 15, 1949
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Affected Aircraft
Sierra Hotel Aero, Inc. Navion (Army L-17A) and Navion A (Army L-17B and L-17C) models equipped with Carter Fuel Pumps Continental P/N 530509 (Carter M687-S and M688-S) or Continental P/N 50375.
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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