# AD 88-26-03: Fuel System Flow Switches

- Type: Airworthiness directive
- Status: Current
- Products: Bell Helicopter Textron Canada 206L and 206L-1
- Effective: January 18, 1989
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-6058
- Docket: 88-ASW-2
- Registered aircraft: 155 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4ED55227F120451D86256A4E004F4E38.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/88-26-03

## The airworthiness directive

88-26-03 BELL HELICOPTER TEXTRON, INC. (BHTI): Amendment 39-6058.

Applies to Model 206L helicopters, S/N's 45001 through 45153 and S/N's 46601 through 46617, and to Bell Model 206L-1 helicopters, S/N's 45154 through 45840, certificated in any category, with fuel system flow switches, P/N's 206-063-635-001, 206-064-601-001, -003, -101, or -103 installed. (Airworthiness Docket No. 88-ASW-2)

Compliance is required as indicated, unless already accomplished.

To prevent a possible fuel system failure due to the malfunction of the fuel system flow switches which could result in an engine flameout and subsequent loss of the helicopter accomplish the following:

  (a) Within the next 250 hours' time in service after the effective date of this AD, remove and replace the fuel system flow switches, P/N's 206-063-635-001, 206-064-601-001, - 003, -101, or -103, whichever is installed, with fuel system flow switch retrofit kit, P/N 206-703- 004-101 and relocate the in-line fuelfilters, P/N 206-063-693-001, in accordance with Bell Helicopter Textron, Inc., Alert Service Bulletin No. 206L-88-52, dated June 10, 1988.

  (b) An alternate method of compliance which provides an equivalent level of safety with this AD may be used when approved by the Manager, Helicopter Certification Branch, Federal Aviation Administration, Fort Worth, Texas 76193-0170.

The procedure shall be done in accordance with Bell Helicopter Textron, Inc., Alert Service Bulletin No. 206L-88-52, dated June 10, 1988. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a)(1) and 1 CFR Part 51. Copies may be obtained from Bell Helicopter Textron, Inc., P.O. Box 482, Fort Worth, Texas 76101, Attention: Customer Support. Copies may be inspected at the Office of the Regional Counsel, FAA, Southwest Region, 4400 Blue Mound Road, Fort Worth, Texas, or at the Office of the Federal Register, 1100 L Street, NW., Room 8401, Washington, D.C.

This amendment (39-6058, AD 88-26-03) becomes effective January 18, 1989.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H2SW](https://openairdocs.org/tcds/H2SW): Bell Textron Canada Limited; names 2 of 12 models: 206L, 206L-1

## 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: 155 (155 by airframe model, 0 by engine model)
- Makers: Bell Helicopter Textron 149, Bell 6

Models with the most aircraft:

- [Bell Helicopter Textron 206L-1](https://openairdocs.org/model/bell-helicopter-textron-206l-1): 149 aircraft (airframe model)
- [Bell 206L](https://openairdocs.org/model/bell-206l): 6 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/88-26-03/models.md
Every aircraft: https://openairdocs.org/ad/88-26-03/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.