AD 77-02-03

final rule
Data completeness: 70%

GENERAL ELECTRIC COMPANY Model CT64-820-4 Engines

AD Number
77-02-03
Status
final_rule
Effective Date
Product Category
engine
Docket
Unknown
FR Citation
This information is not available.

Applicability

TypeManufacturerModelDetails
engine General Electric Company CT64-820-4 GENERAL ELECTRIC COMPANY Model CT64-820-4 Engines

Unsafe Condition

Overstressing of Stage 4 turbine buckets due to engine output shaft overspeed exceeding 1512 rpm.

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Reduce engine output shaft overspeed limit from 1512 rpm to 1450 rpm. Update applicable maintenance and operating data to reflect the new limit.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

within the next 100 hours time in service after the effective date of this AD

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

General Electric Company CT64-820-4 model turboprop engines

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

This site is not affiliated with or endorsed by the FAA. Always verify with official sources.

View Official Source ↗ Find More ADs for General Electric Company CT64-820-4