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AD 57-08-07

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Airworthiness directive · Impeller Drive Gear Assemblies · Curtiss-Wright/Marquette Double Row Turbo Cyclone 972TC18DA1 (R-3350-34, -91), Double Row Turbo Cyclone 972TC18DA2, Double Row Turbo Cyclone 972TC18DA3 and 8 more

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AboutSource files 1
Models
Double Row Turbo Cyclone 972TC18DA1 (R-3350-34, -91), Double Row Turbo Cyclone 972TC18DA2, Double Row Turbo Cyclone 972TC18DA3, Double Row Turbo Cyclone 972TC18DA4, Double Row Turbo Cyclone 981TC18EA1, Double Row Turbo Cyclone 988TC18EA1 and 5 more
Data sheets
TCDSE-287TCDSE-272
Product
Engine

Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.

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The airworthiness directive

57-08-07 WRIGHT: Applies to All TC18DA and TC18EA Series Engines.

Compliance required at overhauls accomplished after May 1, 1957.

To improve the durability of the impeller drive gear assemblies of the subject engines, impeller drive secondary pinion bushings P/N's 170217, 170148, 145213 and 171190 are not eligible for use in engines overhauled after May 1, 1957.

This supersedes AD 57-01-03.

Affected TCDS · 2

The type certificate data sheets for the models this AD names, matched by model and maker.

TCDS E-287Curtiss-Wright/Marquette Inc.Names all 7 models: Double Row Turbo Cyclone 988TC18EA3, Double Row Turbo Cyclone 988TC18EA1, Double Row Turbo Cyclone 988TC18EA5 and 4 moreTCDS E-272Curtiss-Wright/Marquette Inc.Names all 4 models: Double Row Turbo Cyclone 972TC18DA4, Double Row Turbo Cyclone 972TC18DA3, Double Row Turbo Cyclone 972TC18DA1 (R-3350-34; -91) and Double Row Turbo Cyclone 972TC18DA2

Registered aircraft

No registered aircraft matched this AD’s modelsForeign aircraft aren’t included, and ADs on propellers and appliances aren’t matched by model.