SumpThis: Fuel Contamination in General Aviation Aircraft

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AIRWORTHINESS DIRECTIVE

AVIATION STANDARDS NATIONAL FIELD OFFICE
P.O. BOX 26460
OKLAHOMA CITY, OKLAHOMA 73125

The following Airworthiness Directive issued by the Federal Aviation Administration in accordance with the provisions of Federal Aviation Regulations, Part 39, applies to an aircraft model of which our records indicate you may be the registered owner. Airworthiness Directives affect aviation safety. They are regulations which require immediate attention. You are cautioned that no person may operate an aircraft to which an Airworthiness Directive applies, except in accordance with the requirements of Airworthiness Directive (FAR 39.3).

88-21-07 PIPER: Amendment 39-6042. Applies to all Model PA-23, PA-23-160, PA-23-250, PA-23-235 and PA-E23-250 (all serial numbers) airplanes certificated in any category.

Compliance: Required within the next 60 days after the effective date of this AD and at intervals not to exceed 12 calender months thereafter, unless already accomplished.

To reduce the possibility of precipitation and/or wash water from entering the fuel filler compartment and leaking into the fuel cell resulting in engine failure, accomplish the following:

(a)

Inspect the fuel vent/drain lines, the thermos type fuel cell caps, and the fuel filler compartment covers on both main fuel cell systems and, if installed, both auxiliary fuel cell systems in accordance with the instructions in Piper Service Bulletin No. 340, dated May 24, 1971.

(b)

If any defects are found, correct them before further flight.

(c)

Airplanes may be flown in accordance with FAR 21.197 to a location where this AD may 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 210C, 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 these documents at the FAA, Office of the Assistant Chief Counsel, Room 1558, 601 East 12th Street, Kansas City, Missouri 64106.

This amendment, 39-6042, becomes effective on November 6, 1988.

FOR FURTHER INFORMATION CONTACT:

Mr. Robert R. Goodall, Aerospace Engineer, Propulsion Branch, ACE-140A, Atlanta Aircraft Certification Office, FAA, 1669 Phoenix Parkway, Suite 210C, Atlanta, Georgia 30349; Telephone (404) 991-3810.

Revision

Amendment (39-6272, AD 88-21-07 R1) became effective on August 22, 1989 and revises the above AD 88-21-07.

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(a)	Inspect the fuel vent/drain lines, the thermos type fuel cell caps, and the fuel filler compartment covers on both main fuel cell systems and, if installed, both auxiliary fuel cell systems in accordance with the instructions in Piper Service Bulletin No. 340, dated May 24, 1971.
(b)	If any defects are found, correct them before further flight.
(c)	Airplanes may be flown in accordance with FAR 21.197 to a location where this AD may 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 210C, Atlanta, Georgia 30349.