# AD 87-21-01: Fuel Filler Openings - Type: Airworthiness directive - Status: Current - Products: Aerostar PA-60-600 (Aerostar 600), PA-60-601 (Aerostar 601), PA-60-601P (Aerostar 601P), PA-60-602P (Aerostar 602P), PA-60-700P (Aerostar 700P), PA-31, PA-31-300, PA-31-325, PA-31-350, PA-31P, PA-31P-350, PA-31 and 5 more - Effective: November 2, 1987 - Published: October 1, 1987 - Issued: September 17, 1987 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-5739 - Registered aircraft: 687 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DE445EE95D62EDFA862569A6005C8A03.0001 - DRS record last changed: November 21, 2025 - Page: https://openairdocs.org/ad/87-21-01 ## The airworthiness directive 87-21-01 PIPER: Amendment 39-5739. Applies to Models PA-31, PA-31-300, PA-31- 325 (S/N 31-1 thru 31-8312019), PA-31-350 (S/N 31-5001 thru 31-8452021), PA-31-350 (T1020) (S/N 31-8253001 thru 31-8553002), PA-31P (S/N 31P-1 thru 31P-7730012), PA31P-350 (S/N 31P-8414001 thru 31P-8414050), PA-60-600, PA-60-601, PA-60-601P, PA-60-602P, PA-60-700P, (all S/N's) airplanes equipped with reciprocating engines certificated in any category. Compliance: Required as indicated, unless already accomplished. To preclude misfueling of the airplane resulting in engine failure, accomplish the following: (a) Within the next 12 calendar months after the effective date of this AD, unless already accomplished, modify the fuel filler opening(s) in accordance with the instructions contained in Piper Aircraft Corporation Service Bulletin No. 797B, dated September 1, 1987. NOTE: This AD does not apply to the PA-23-250 (Aztec F) or the PA-36 (Brave) which are also listed on Piper Service Bulletin No. 797B. (b) Airplanes may be flown in accordance with FAR 21.197 to a location where this AD may be accomplished. (c) In accordance with FAR Part 43, Appendix A, item (c) 29, the modifications required by this AD are preventative maintenance and may be performed by the holder of a pilot certificate issued under FAR Part 61 on airplanes owned or operated by him, subject to the limitations of FAR 43.3(g). The maintenance record entries required by FAR 43.9 and FAR 91.173 must be accomplished. (d) An equivalent means of compliance with this AD may be used if approved by the Manager, Atlanta Aircraft Certification Office, ACE-115A, Federal Aviation Administration, 1669 Phoenix Parkway, Suite 210, Atlanta, Georgia 30349. All persons affected by this directive may obtain copies of the document(s) referred to herein upon request to Piper Aircraft Corporation, 2926 Piper Drive, Vero Beach, Florida 32960; or may examine the document(s) referred to herein at theFAA, Office of the Regional Counsel, Room 1558, 601 East 12th Street, Kansas City, Missouri 64106. This amendment becomes effective on November 2, 1987. ## Affected data sheets (3) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A17WE](https://openairdocs.org/tcds/A17WE): Aerostar Aircraft Corporation; names 5 of 5 models: PA-60-601P (Aerostar 601P), PA-60-601 (Aerostar 601), PA-60-602P (Aerostar 602P), PA-60-600 (Aerostar 600), PA-60-700P (Aerostar 700P) - [TCDS A20SO](https://openairdocs.org/tcds/A20SO): Piper Aircraft Inc.; names 4 of 4 models: PA-31, PA-31-325, PA-31-300, PA-31-350 - [TCDS A8EA](https://openairdocs.org/tcds/A8EA): Piper Aircraft Inc.; names 2 of 6 models: PA-31P-350, PA-31P ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 687 (687 by airframe model, 0 by engine model) - Makers: Piper 687 Models with the most aircraft: - [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350): 399 aircraft (airframe model) - [Piper PA-31-325](https://openairdocs.org/model/piper-pa-31-325): 137 aircraft (airframe model) - [Piper PA-31P](https://openairdocs.org/model/piper-pa-31p): 40 aircraft (airframe model) - [Piper PA-60-602P](https://openairdocs.org/model/piper-pa-60-602p): 31 aircraft (airframe model) - [Piper PA-31](https://openairdocs.org/model/piper-pa-31): 26 aircraft (airframe model) - [Piper PA 31P 350](https://openairdocs.org/model/piper-pa-31p-350): 25 aircraft (airframe model) - [Piper PA-60-700P](https://openairdocs.org/model/piper-pa-60-700p): 17 aircraft (airframe model) - [Piper PA-60-601P](https://openairdocs.org/model/piper-pa-60-601p): 9 aircraft (airframe model) - [Piper PA-31-300](https://openairdocs.org/model/piper-pa-31-300): 3 aircraft (airframe model) All 9 models: https://openairdocs.org/ad/87-21-01/models.md Every aircraft: https://openairdocs.org/ad/87-21-01/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.