AD 78-26-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | CT58-100-2 | GENERAL ELECTRIC COMPANY Model CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1 and CT58-140-2 engines. |
| engine | General Electric Company | CT58-110-1 | GENERAL ELECTRIC COMPANY Model CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1 and CT58-140-2 engines. |
| engine | General Electric Company | CT58-110-2 | GENERAL ELECTRIC COMPANY Model CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1 and CT58-140-2 engines. |
| engine | General Electric Company | CT58-140-1 | GENERAL ELECTRIC COMPANY Model CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1 and CT58-140-2 engines. |
| engine | General Electric Company | CT58-140-2 | GENERAL ELECTRIC COMPANY Model CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1 and CT58-140-2 engines. |
Unsafe Condition
Failure of the lube pump drive shaft and resultant loss of oil pressure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform actions per General Electric Alert Service Bulletin CEB-253 (CT58 A72-157). Remove and replace pumps based on time in service: those with ≤50 hours within 4 hours, and 50-500 hours within 50 hours after AD effective date. Inspect removed and spare pumps, replace Viton seals with Sirvene seals, and check for damage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the specified hours operating time after the effective date of this AD (December 19, 1978).
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Affected Aircraft
General Electric Company models CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1 series A&L, CT58-140-1, and CT58-140-2 engines. Includes pumps with specific part numbers and serial ranges, and engines with serial numbers 295218 through 295233, 295235 through 295241, 295243 through 295249, and 295255.
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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