AD 90-15-04

90-15-04 BRITISH AEROSPACE: Amendment 39-6652. Docket No. 90-NM-41-AD. Applicability: Model BAC 1-11 200 and 400 series airplanes, pre-modification PM5384, certificated in any category.

Compliance: Required within 2,400 hours time-in-service or two years after the effective date of this AD, whichever occurs first, unless previously accomplished within the past 2,400 hours time-in-service or within the past two years; and thereafter at intervals not to exceed 4,800 hours time-in-service or four years, whichever occurs first.

To prevent tailplane trim gearbox oil from being contaminated with water, accomplish the following:

A. Remove the tailplane trim gearbox from the airplane, drain the oil, flush and refill with clean oil, and replace the filler plug and wire lock, in accordance with paragraph 2.2 of British Aerospace Alert Service Bulletin 27-A-PM5384, Issue 1, dated July 24, 1989. Reinstall the gearbox in the airplane and test in accordance with Maintenance Manual Chapter 27-40.

B. 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, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate.

NOTE: The request should be submitted directly to the Manager, Standardization Branch, ANM-113, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Manager, Standardization Branch, ANM-113.

C. 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 documents from the manufacturer may obtain copies upon request to British Aerospace, PLC, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041-0414. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or the Standardization Branch, 9010 East Marginal Way South, Seattle, Washington.

This amendment (39-6652, AD 90-15-04) becomes effective on August 14, 1990.