AD 88-24-04 R1

88-24-04 R1 MCDONNELL DOUGLAS: Amendment 39-6066 as revised by Amendment 39-6510. Docket No. 89-NM-199-AD.

Applicability: McDonnell Douglas Model DC-9, C-9 (Military), and DC-9-80 (MD-80) series airplanes, and Model MD-88 airplanes, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent fire in the aft accessory compartment, accomplish the following:

A. Within 30 days or 300 flight hours time-in-service after December 2, 1988 (the effective date of AD 88-24-04, Amendment 39-6066), whichever occurs first, or upon the accumulation of 3,000 flight hours time-in-service since new, whichever occurs later, accomplish the following:

1. Check for evidence of fuel on the APU exhaust ducting and in the surrounding area in the aft accessory compartment, including the insulation blankets. Remove any fuel before the next APU start attempt.

2. Install a placard on or above the center instrument panel in a location that allows it to be in full view of both pilot and co-pilot, and on the aircraft logbook, stating the following: "DO NOT ATTEMPT TO RESTART APU AFTER A FALSE START UNTIL CHECK OF AFT ACCESSORY COMPARTMENT FOR FUEL IS ACCOMPLISHED."

3. Add the following to the Limitations Section of the FAA-approved Airplane Flight Manual (AFM). This may be accomplished by inserting a copy of this AD in the AFM: "DO NOT ATTEMPT TO RESTART APU AFTER A FALSE START UNTIL CHECK OF AFT ACCESSORY COMPARTMENT FOR FUEL IS ACCOMPLISHED."

B. Within 36 months from the effective date of this amendment, inspect, modify, and repair the APU exhaust duct assembly in accordance with procedures described in Figures 3, 4, and 5 of McDonnell Douglas DC-9 Service Bulletin A49-40, Revision 1, dated May 16, 1989. Once the actions required by this paragraph are accomplished, the placard and AFM change required by paragraph A., above, may be removed.

C. Within 36 months from the effective date of this amendment, trim the ends of the APU forward lower frame and modify the aft pressure bulkhead insulation blanket, in accordance with procedures described in McDonnell Douglas DC-9 Service Bulletin 53-229, dated July 6, 1989.

D. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either concur or comment and then send it to the Manager, Los Angeles Aircraft Certification Office.

E. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies uponrequest to McDonnell Douglas Corporation, 3855 Lakewood Boulevard, Long Beach, California 90846, Attention: Group Leader, DC-9/MD-80, Technical Publications, C1-HCP (54-60). These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or at the Los Angeles Aircraft Certification Office, 3229 East Spring Street, Long Beach, California.

This AD revises AD 88-24-04, Amendment 39-6066.

This amendment (39-6510, AD 88-24-04 R1) becomes effective on March 19, 1990.