AD 90-08-07

90-08-07 BRITISH AEROSPACE: Amendment 39-6600. Docket No. 90-NM-60-AD. Final copy of Priority Letter AD.

Applicability: Model BH.125-600A, HS.125-700A, and BAe 125-800A series airplanes, equipped with a cabin interior and aft lavatory water system installed in accordance with STC SA2271SW, certificated in any category.

Compliance: Required prior to further flight, unless previously accomplished.

To prevent loss of aileron control, accomplish the following:

A. Drain all water from the aft lavatory water system reservoir, deactivate the water system pressure pump by pulling the circuit breaker located beneath the vanity in the aft lavatory, and install a tie wrap on the circuit breaker to prevent it from being reset.

B. 1. The aft lavatory water system pressure pump may be reactivated upon accomplishment of a modification which has been approved by the Manager, Special Programs Office, ASW-190, FAA, Southwest Region. 2. 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, Special Programs Office, ASW-190, FAA, Southwest 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, Special Programs Office, ASW-190.

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.

This amendment (39-6600, AD 90-08-07) becomes effective on May 29, 1990, as to all persons, except those persons to whom it was made immediately effective by priority letter AD 90-08-07, issued April 10, 1990, which contained this amendment.