AD 88-06-07

88-06-07 GENERAL ELECTRIC: Amendment 39-5866. Applies to General Electric (GE) CF34-1A and -3A turbofan engines installed in the Canadair Limited Model CL-600-2A12 and CL-600-2B16 aircraft.

Compliance is required as indicated, unless already accomplished.

To prevent an engine flameout or uncommanded power roll-back and subsequent inflight shutdown due to contamination of the fuel control, accomplish the following:

(a) For the engines not operated in accordance with Canadair Airplane Flight Manual (AFM) Temporary Revision Numbers 601/10-1 and 601/11 for Model CL-600-2B16, or Temporary Revision Numbers 601/17-1 and 601/18 for Model CL-600-2A12, accomplish the following prior to further flight after the effective date of this AD:

(1) For engines with fuel controls identified in GE Service Bulletin (SB) Number (CF34) 73-5, dated January 22, 1988, replace the fuel control with a reworked unit which has a redesigned bypass valve piston installed and cleaned internally by the improved process, in accordance with this SB.

(2) For engines with fuel controls identified in GE SB Number 73-6, dated January 22, 1988, replace the bypass valve piston with redesigned hardware in accordance with this SB.

(b) For the engines operated in accordance with Canadair AFM Temporary Revisions Numbers 601/10-1 and 601/11 for Model CL-600-2B16, or Temporary Revision Numbers 601/17-1 and 601/18 for Model CL-600-2A12, accomplish paragraphs (a)(1) and (a)(2) above within 500 hours in service from the effective date of this AD, or prior to September 30, 1988, whichever occurs sooner.

(c) Aircraft may be ferried in accordance with the provision of FAR 21.197 and 21.199 to a base where the AD can be accomplished.

(d) Upon request, an equivalent means of compliance with the requirements of the AD may be approved by the Manager, Engine Certification Office, Aircraft Certification Division, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803.

(e) Upon submission of substantiating data by an owner or operator through an FAA maintenance inspector, the Manager, Engine Certification Office, New England Region, may adjust the compliance times specified in this AD.

The GE SB's identified and described in this document are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received the engine manufacturer's SB's may obtain copies upon request to General Electric Company, 1000 Western Avenue, Lynn, Massachusetts 01910.

These documents also may be examined at the Office of the Regional Counsel, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, Room 311, Rules Docket Number 88-ANE-08, between the hours of 8:00 a.m. and 4:30 p.m., Monday through Friday, except federal holidays.

This amendment becomes effective on March 23, 1988.