AD 49-05-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sierra Hotel Aero, Inc. | Navion (Army L-17A) | Airworthiness Directives; Navion Airplanes Equipped With Continental Model E185-3 Engines Having Serial Numbers 4289-D to 5110-D Inclusive, and Engines Which Have Been Equipped at Overhaul With Tri-Metal Front Main Bearing Inserts and Bronze Thrust Washers in Accordance With Continental Bulletin No. M48-7. |
| aircraft | Sierra Hotel Aero, Inc. | Navion A (Army L-17B and L-17C) | Airworthiness Directives; Navion Airplanes Equipped With Continental Model E185-3 Engines Having Serial Numbers 4289-D to 5110-D Inclusive, and Engines Which Have Been Equipped at Overhaul With Tri-Metal Front Main Bearing Inserts and Bronze Thrust Washers in Accordance With Continental Bulletin No. M48-7. |
Unsafe Condition
Unsatisfactory service experience with Continental E185-3 engines equipped with No. 530497 Tri-Metal front main bearing inserts and thrust washers/pins (Nos. 530494, 530495, 530544 and 530545 dowel pins) leading to potential engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace No. 530497 Tri-Metal front main bearing inserts and Nos. 530494, 530495, 530544 thrust washers and 530545 dowel pins with original silver main thrust bearing inserts (Continental No. 40644).
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Compliance Time
as soon as possible but not later than the first major engine overhaul
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Affected Aircraft
Navion (Army L-17A) and Navion A (Army L-17B and L-17C) airplanes equipped with Continental Model E185-3 engines having serial numbers 4289-D to 5110-D inclusive, or engines overhauled with tri-metal front main bearing inserts and bronze thrust washers per Continental Bulletin No. M48-7
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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