AD 92-15-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Canada Corp. | PT6A-20 | PRATT & WHITNEY CANADA Models PT6A-6, PT6A-6/C20, PT6A-20, PT6A-20A, PT6A-21, PT6A-27, PT6A-28, PT6A-34, PT6A-34B, and PT6A-36 |
| engine | Pratt & Whitney Canada Corp. | PT6A-20A | PRATT & WHITNEY CANADA Models PT6A-6, PT6A-6/C20, PT6A-20, PT6A-20A, PT6A-21, PT6A-27, PT6A-28, PT6A-34, PT6A-34B, and PT6A-36 |
| engine | Pratt & Whitney Canada Corp. | PT6A-21 | PRATT & WHITNEY CANADA Models PT6A-6, PT6A-6/C20, PT6A-20, PT6A-20A, PT6A-21, PT6A-27, PT6A-28, PT6A-34, PT6A-34B, and PT6A-36 |
| engine | Pratt & Whitney Canada Corp. | PT6A-27 | PRATT & WHITNEY CANADA Models PT6A-6, PT6A-6/C20, PT6A-20, PT6A-20A, PT6A-21, PT6A-27, PT6A-28, PT6A-34, PT6A-34B, and PT6A-36 |
| engine | Pratt & Whitney Canada Corp. | PT6A-28 | PRATT & WHITNEY CANADA Models PT6A-6, PT6A-6/C20, PT6A-20, PT6A-20A, PT6A-21, PT6A-27, PT6A-28, PT6A-34, PT6A-34B, and PT6A-36 |
| engine | Pratt & Whitney Canada Corp. | PT6A-34 | PRATT & WHITNEY CANADA Models PT6A-6, PT6A-6/C20, PT6A-20, PT6A-20A, PT6A-21, PT6A-27, PT6A-28, PT6A-34, PT6A-34B, and PT6A-36 |
| engine | Pratt & Whitney Canada Corp. | PT6A-34B | PRATT & WHITNEY CANADA Models PT6A-6, PT6A-6/C20, PT6A-20, PT6A-20A, PT6A-21, PT6A-27, PT6A-28, PT6A-34, PT6A-34B, and PT6A-36 |
| engine | Pratt & Whitney Canada Corp. | PT6A-36 | PRATT & WHITNEY CANADA Models PT6A-6, PT6A-6/C20, PT6A-20, PT6A-20A, PT6A-21, PT6A-27, PT6A-28, PT6A-34, PT6A-34B, and PT6A-36 |
| engine | Pratt & Whitney Canada Corp. | PT6A-6 | PRATT & WHITNEY CANADA Models PT6A-6, PT6A-6/C20, PT6A-20, PT6A-20A, PT6A-21, PT6A-27, PT6A-28, PT6A-34, PT6A-34B, and PT6A-36 |
| engine | Pratt & Whitney Canada Corp. | PT6A-6/C20 | PRATT & WHITNEY CANADA Models PT6A-6, PT6A-6/C20, PT6A-20, PT6A-20A, PT6A-21, PT6A-27, PT6A-28, PT6A-34, PT6A-34B, and PT6A-36 |
Unsafe Condition
Excessive engine acceleration time could result in an aircraft's inability to safely perform the balked landing maneuver required by Federal Aviation Regulations (FAR) part 23, paragraphs 23.75(d), 23.77 and 23.143(a)(5).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a visual inspection to determine if a compressor delivery air line (P3) filter assembly is installed. Remove the P3 filter assembly from service if installed. Alternative methods of compliance or adjustments to compliance time may be used if approved by the Manager, Engine Certification Office.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 180 days after the effective date of this AD, unless accomplished previously
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Canada PT6A-6, PT6A-6/C20, PT6A-20, PT6A-20A, PT6A-21, PT6A-27, PT6A-28, PT6A-34, PT6A-34B, and PT6A-36 turboprop engines installed on specified Beech Aircraft Corporation models.
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.