# AD 87-21-07 R1: Fuel Filler Openings - Type: Airworthiness directive - Status: Current - Products: Twin Commander 500, 500-A, 500-B, 500-S, 500-U, 520, 560, 560-A, 560-E, 560-F, 680, 680-E and 7 more - Effective: May 5, 1989 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-6182 - Registered aircraft: 273 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/113507EA53924F5186256A4D0047C51C.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/87-21-07-R1 ## The airworthiness directive 87-21-07 R1 GULFSTREAM (AERO COMMANDER): Amendment 39-5741 as revised by Amendment 39-6182. Applicability: Models 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL(P), and 720 Serial Numbers (S/N 1 through 1854); and Models 500S (S/N 1755 through 3323), 680FL (S/N 1261 through 1853), 685 (S/N 12001 through 12066), and 700 (S/N 70001 through 70032) 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 revised AD, unless already accomplished in accordance with the requirements of AD 87-21-07 effective November 12, 1987, modify all fuel filler opening(s) in accordance with the applicable instructions contained in Gulfstream Service Information No. SI-209A, dated June 7, 1988.NOTE: AD 73-6-2, applicable to certain of the above-referenced airplanes, is a prerequisite to the accomplishment of the actions prescribed in this AD. (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), 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's 43.9 and 91.173 must be accomplished. (d) An equivalent means of compliance with this AD may be used if approved by the Manager, Airplane Certification Branch, Southwest Region, Department of Transportation, FAA, Fort Worth, Texas 76193-0150, Telephone (817) 624-5150. All persons affected by this directive may obtain copies of the documents referred to herein upon request to the Gulfstream Aerospace Corporation, Wiley Post Airport, P.O. Box 22500, Oklahoma City, Oklahoma 73123; or may examine these documents at the FAA, Office of the Assistant Chief Counsel, Room 1558, 601 East 12th Street, Kansas City, Missouri 64106. This amendment revises AD 87-21-07, (Amendment 39-5741). This amendment (39-6182, AD 87-21-07 R1) becomes effective May 5, 1989. ## Affected data sheets (3) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 6A1](https://openairdocs.org/tcds/6A1): Twin Commander Aircraft LLC; names 9 of 9 models: 500, 500A, 500B, 500U, 520, 560, 560A, 560E… - [TCDS 2A4](https://openairdocs.org/tcds/2A4): Twin Commander Aircraft LLC; names 7 of 21 models: 680-F, 680-E, 560-F, 720, 680-FL, 680, 685 - [TCDS A12SW](https://openairdocs.org/tcds/A12SW): Twin Commander Aircraft LLC; names 1 of 1 models: 700 ## 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: 273 (273 by airframe model, 0 by engine model) - Makers: Aero Commander 254, Rockwell International 19 Models with the most aircraft: - [Aero Commander 500-B](https://openairdocs.org/model/aero-commander-500-b): 85 aircraft (airframe model) - [Aero Commander 500 S](https://openairdocs.org/model/aero-commander-500-s): 45 aircraft (airframe model) - [Aero Commander 500-A](https://openairdocs.org/model/aero-commander-500-a): 23 aircraft (airframe model) - [Rockwell International 500-S](https://openairdocs.org/model/rockwell-international-500-s): 19 aircraft (airframe model) - [Aero Commander 500](https://openairdocs.org/model/aero-commander-500): 12 aircraft (airframe model) - [Aero Commander 520](https://openairdocs.org/model/aero-commander-520): 12 aircraft (airframe model) - [Aero Commander 680](https://openairdocs.org/model/aero-commander-680): 12 aircraft (airframe model) - [Aero Commander 680-F](https://openairdocs.org/model/aero-commander-680-f): 11 aircraft (airframe model) - [Aero Commander 560-A](https://openairdocs.org/model/aero-commander-560-a): 10 aircraft (airframe model) - [Aero Commander 680FL](https://openairdocs.org/model/aero-commander-680fl): 10 aircraft (airframe model) - [Aero Commander 685](https://openairdocs.org/model/aero-commander-685): 8 aircraft (airframe model) - [Aero Commander 560-F](https://openairdocs.org/model/aero-commander-560-f): 6 aircraft (airframe model) - [Aero Commander 560-E](https://openairdocs.org/model/aero-commander-560-e): 5 aircraft (airframe model) - [Aero Commander 680FL P](https://openairdocs.org/model/aero-commander-680fl-p): 5 aircraft (airframe model) - [Aero Commander 680-E](https://openairdocs.org/model/aero-commander-680-e): 4 aircraft (airframe model) - [Aero Commander 500-U](https://openairdocs.org/model/aero-commander-500-u): 3 aircraft (airframe model) - [Aero Commander 560](https://openairdocs.org/model/aero-commander-560): 2 aircraft (airframe model) - [Aero Commander 720](https://openairdocs.org/model/aero-commander-720): 1 aircraft (airframe model) All 18 models: https://openairdocs.org/ad/87-21-07-R1/models.md Every aircraft: https://openairdocs.org/ad/87-21-07-R1/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.