AD 66-14-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | Military R-985 Series | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. A | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. B-4 | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. B-5 | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. SB | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. SB-2 | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. SB-3 | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. T1B | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. T1B2 | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. T1B3 | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. T3A | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. TB | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. TB-2 | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
Unsafe Condition
Failure of the cam reduction drive gear assembly and resultant loss of engine power
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace cam reduction drive gear assembly, P/N 3965, with cam reduction drive gear, P/N 331098.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
at the next engine overhaul after the effective date of this AD unless already accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Model Wasp Jr. and R-985 Series Engines with cam reduction drive gear assembly, P/N 3965
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Cam Reduction Drive Gear Assembly
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_66-14-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 66-14-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines Subject: Cam Reduction Drive Gear Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/09/1966 Make: Pratt & Whitney Division Model: Military R-985 Series | Wasp Jr. A | Wasp Jr. B-4 | Wasp Jr. B-5 | Wasp Jr. SB | Wasp Jr. SB-2 | Was...Show more Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 66-14-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-247 AD NUMBER: 66-14-04 SUBJECT HEADING: PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines ACTION: SUMMARY: DATES: Effective July 9, 1966. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 66-14-04 PRATT & WHITNEY: Amdt. 39-247 Part 39 Federal Register June 8, 1966. Applies to Pratt & Whitney Aircraft Wasp Jr. and R-985 Series Engines. Compliance required at the next engine overhaul after the effective date of this AD unless already accomplished. To prevent failure of the cam reduction drive gear assembly and resultant loss of engine power, replace cam reduction drive gear assembly, P/N 3965, with cam reduction drive gear, P/N 331098. (Pratt & Whitney Aircraft Service Bulletin No. 1671, Supplement No. 1, Revision A, revised November 24, 1959, pertains to this subject.) This supersedes AD 62-11-05. This directive effective July 9, 1966. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_66-14-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 66-14-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines Subject: Cam Reduction Drive Gear Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/09/1966 Make: Pratt & Whitney Division Model: Military R-985 Series | Wasp Jr. A | Wasp Jr. B-4 | Wasp Jr. B-5 | Wasp Jr. SB | Wasp Jr. SB-2 | Was...Show more Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 66-14-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-247 AD NUMBER: 66-14-04 SUBJECT HEADING: PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines ACTION: SUMMARY: DATES: Effective July 9, 1966. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 66-14-04 PRATT & WHITNEY: Amdt. 39-247 Part 39 Federal Register June 8, 1966. Applies to Pratt & Whitney Aircraft Wasp Jr. and R-985 Series Engines. Compliance required at the next engine overhaul after the effective date of this AD unless already accomplished. To prevent failure of the cam reduction drive gear assembly and resultant loss of engine power, replace cam reduction drive gear assembly, P/N 3965, with cam reduction drive gear, P/N 331098. (Pratt & Whitney Aircraft Service Bulletin No. 1671, Supplement No. 1, Revision A, revised November 24, 1959, pertains to this subject.) This supersedes AD 62-11-05. This directive effective July 9, 1966. FOOTER:
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.
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