AD 88-07-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | CT7-5A2 | GENERAL ELECTRIC Model CT7-5A, -5A1, and -5A2 Engines |
Unsafe Condition
Power turbine overspeed resulting in an uncontained failure or adverse aircraft yaw due to reaction of the fuel control to an erroneous PT speed signal during ground operation with the bottoming governor enabled.
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Required Actions
Remove propeller overspeed governor (Dowty Rotol P/N 661001001) and replace with P/N 661001002 per DR SB SF340-61-11. Install cable GE P/N 6068T47P01 between OSG and hydromechanical unit per GE SB 74-09. Install engine BG deactivation switches (Saab Mod Kit SF340-76-018-01) per Saab SB SF340-76-018. Remove BG disabling procedures from AFM per AD 86-10-51 and discontinue those procedures. Ferrying allowed under FAR 21.197/199. Equivalent compliance may be approved.
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Compliance Time
no later than May 16, 1988
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Affected Aircraft
General Electric CT7-5A, -5A1, and -5A2 engines installed in Saab-Fairchild SF340A aircraft
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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