# AD 85-12-51: Approved Fuel

- Type: Airworthiness directive
- Status: Current
- Products: Boeing 737-100 Series and 737-200 Series
- Effective: August 6, 1985
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-5104
- Registered aircraft: 6 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/735EFAEEA8960524862568AA005C6283.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/85-12-51

## The airworthiness directive

85-12-51 BOEING: Amendment 39-5104. Applies to Model 737-100 and -200 series airplanes equipped with Plessey Type 8240 Mark 1, 2, or 3 boost pumps and certificated in any category.

To prevent engine flameouts during climb, accomplish the following, unless already accomplished:

1. Before further flight ensure that the fuel being used is one of the following types:

o Jet A or A1 conforming to specification ASTM-D-1655; or o JP-5 conforming to MIL-T-5624.

2. Within 48 hours incorporate the following information into the Limitations Section of the Airplane Flight Manual and provide to crews:

"The only approved fuels are Jet A and A1 conforming to Specification ASTM- D-1655, and JP-5 conforming to MIL-T-5624."

3. Alternate means of compliance which provide an acceptable level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region.

NOTE: Compliance with Paragraph 2. of this directive may be effected by including a copy of this AD in the Airplane Flight Manual and Operating Manual.

This amendment becomes effective August 6, 1985. It was effective earlier to all recipients of telegraphic AD T85-12-51, issued June 13, 1985, which contained this amendment.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A16WE](https://openairdocs.org/tcds/A16WE): The Boeing Company; names 2 of 17 models: 737-100 Series, 737-200 Series

## 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: 6 (6 by airframe model, 0 by engine model)
- Makers: Boeing 6

Models with the most aircraft:

- [Boeing 737-205](https://openairdocs.org/model/boeing-737-205): 3 aircraft (airframe model)
- [Boeing 737-200](https://openairdocs.org/model/boeing-737-200): 1 aircraft (airframe model)
- [Boeing 737-201](https://openairdocs.org/model/boeing-737-201): 1 aircraft (airframe model)
- [Boeing 737-209](https://openairdocs.org/model/boeing-737-209): 1 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/85-12-51/models.md
Every aircraft: https://openairdocs.org/ad/85-12-51/aircraft.md

Its text cites no advisory circulars or STCs.

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