# AD 93-17-01: Leading Edge Fuel Cell Nipples

- Type: Airworthiness directive
- Status: Current
- Products: Textron B90, C90 and C90A
- Effective: October 12, 1993
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-8671
- Docket: 93-CE-23-AD
- Registered aircraft: 525 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/417AE53EF6FFC83A86256A09005CB473.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/93-17-01

## The airworthiness directive

93-17-01 BEECH AIRCRAFT CORPORATION: Amendment 39-8671. Docket No. 93-CE- 23-AD.

Applicability: Models B90, C90, and C90A airplanes (serial numbers LJ-489 through LJ-1318), certificated in any category.

Compliance: Required within the next 150 hours time-in-service after the effective date of this AD, unless already accomplished.

To prevent failure of the leading edge fuel cell nipples caused by cracking and fuel leaks, which, if not detected and corrected, could result in an airplane fire, accomplish the following:

  (a) Inspect the inboard nipple on the leading edge fuel cell for cracks or fuel leaks in accordance with Part I of the ACCOMPLISHMENT INSTRUCTIONS section of Beech Service Bulletin (SB) No. 2475, dated February 1993. If cracks or fuel leaks are found, prior to further flight, repair the fuel cells in accordance with procedures specified in the applicable maintenance manual.

  (b) Replace the fuel interconnect tube assembly in accordance with Part II of the ACCOMPLISHMENT INSTRUCTIONS section of Beech SB No. 2475, dated February 1993.

  (c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.

  (d) An alternative method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, Wichita Aircraft Certification Office, FAA, 1801 Airport Road, Mid-Continent Airport, Wichita, Kansas 67209. The request shall be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Wichita Aircraft Certification Office.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Wichita Aircraft Certification Office.

  (e) The inspection and replacement required by this AD shall be done in accordance with Beech Service Bulletin No. 2475, dated February 1993. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from the Beech Aircraft Corporation, P.O. Box 85, Wichita, Kansas 67201-0085. Copies may be inspected at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

  (f) This amendment becomes effective on October 12, 1993.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 3A20](https://openairdocs.org/tcds/3A20): Textron Aviation Inc.; names 3 of 22 models: B90, C90A, C90

## 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: 525 (525 by airframe model, 0 by engine model)
- Makers: Beech 370, Raytheon 155

Models with the most aircraft:

- [Beech C90](https://openairdocs.org/model/beech-c90): 216 aircraft (airframe model)
- [Raytheon C90A](https://openairdocs.org/model/raytheon-c90a): 155 aircraft (airframe model)
- [Beech C90A](https://openairdocs.org/model/beech-c90a): 125 aircraft (airframe model)
- [Beech B90](https://openairdocs.org/model/beech-b90): 29 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/93-17-01/models.md
Every aircraft: https://openairdocs.org/ad/93-17-01/aircraft.md

Its text cites no advisory circulars or STCs.

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