AD 96-21-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-23 | Airworthiness Directives; The New Piper Aircraft, Inc. (formerly Piper Aircraft Corporation) PA23, PA31, PA31P, PA31T, and PA42 Series Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-160 | Airworthiness Directives; The New Piper Aircraft, Inc. (formerly Piper Aircraft Corporation) PA23, PA31, PA31P, PA31T, and PA42 Series Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-235 | Airworthiness Directives; The New Piper Aircraft, Inc. (formerly Piper Aircraft Corporation) PA23, PA31, PA31P, PA31T, and PA42 Series Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-250 | Airworthiness Directives; The New Piper Aircraft, Inc. (formerly Piper Aircraft Corporation) PA23, PA31, PA31P, PA31T, and PA42 Series Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-250 (Navy UO-1) | Airworthiness Directives; The New Piper Aircraft, Inc. (formerly Piper Aircraft Corporation) PA23, PA31, PA31P, PA31T, and PA42 Series Airplanes |
| aircraft | Piper Aircraft Inc. | PA-31 | Airworthiness Directives; The New Piper Aircraft, Inc. (formerly Piper Aircraft Corporation) PA23, PA31, PA31P, PA31T, and PA42 Series Airplanes |
| aircraft | Piper Aircraft Inc. | PA-31-300 | Airworthiness Directives; The New Piper Aircraft, Inc. (formerly Piper Aircraft Corporation) PA23, PA31, PA31P, PA31T, and PA42 Series Airplanes |
| aircraft | Piper Aircraft Inc. | PA-31-325 | Airworthiness Directives; The New Piper Aircraft, Inc. (formerly Piper Aircraft Corporation) PA23, PA31, PA31P, PA31T, and PA42 Series Airplanes |
| aircraft | Piper Aircraft Inc. | PA-31-350 | Airworthiness Directives; The New Piper Aircraft, Inc. (formerly Piper Aircraft Corporation) PA23, PA31, PA31P, PA31T, and PA42 Series Airplanes |
| aircraft | Piper Aircraft Inc. | PA-31P | Airworthiness Directives; The New Piper Aircraft, Inc. (formerly Piper Aircraft Corporation) PA23, PA31, PA31P, PA31T, and PA42 Series Airplanes |
Unsafe Condition
Hydraulic hose failure which could cause loss of hydraulic capabilities resulting in a gear-up landing and possible loss of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect and replace all hydraulic hoses identified as Piper part number 17766-02 or 465-138 with smooth rubber surface and blue colored end nut with hoses having woven outer covering and black colored end nut, in accordance with Piper Service Bulletin No. 822 dated April 2, 1986.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours time-in-service after September 2, 1986 or within 10 hours time-in-service after December 10, 1996, whichever occurs later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
The New Piper Aircraft, Inc. PA23, PA31, PA31P, PA31T, and PA42 series airplanes with specific serial numbers: PA23/PA23-160 (23-1 to 23-2046), PA23-235 (27-505 to 27-622), PA23-250 (27-1 to 27-8154030), PA31/PA31-300/PA31-325 (31-2 to 31-8312019), PA31-350 (31-5001 to 31-8553002), PA31P (31P-1 to 31P-7730012), PA31P-350 (31P-8414001 to 31P-8414050), PA31T (31T-7400002 to 31T-8120104), PA31T1 (31T-7804001 to 31T-8304003 and 31T-1104004 to 31T-1104017), PA31T2 (31T-8166001 to 31T-8166076 and 31T-1166001 to 31T-1166008), PA31T3 (31T-8275001 to 31T-8475001 and 31T-5575001), PA42 (specific serial numbers listed in the AD).
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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