Remarks: The compliance of this AD must be recorded in Aircraft Logbook, where applicable the requirements of this AD must be integrated into Aircraft Technical Documentation. Address inquiries concerning this AD to: Civil Aviation Authority, Airworthiness Division, Ruzyne Airport, 160 08 Prague 6, Czech Republic, tel: 420 2 33320922, fax: 420 2 20562270.

Loss of auto-trim function (ATA 22)

- A300 aircraft in their FF version "forward facing" cockpit, (Certified version for A300B2-203, A300B4-203 and A300B4-220 models), all serial numbers, and

- A310 and A300-600 aircraft, all certified models and all serial numbers.

Recently, an A300-600 aircraft flight with Auto-Pilot 1. Pitch Trim 1 and 2 engaged, was unable to hold the vertical speed selected by the crew.

A maintenance check later revealed that this situation was due to an open circuit between Flight Control Computer 1 (FCC l) and Flight Augmentation Computer 1 (FAC 1).

If left uncorrected, this failure could lead to a potential out-of-trim-situation and, in case of auto-pilot disconnection, to a sudden pitch attitude change.

A Pitch Trim system maintenance check, to be performed before January 31, 2000, was rendered mandatory by Airworthiness Directive (AD) 2000-007-301(B).

This AD defines a program of repetitive tests enabling the aircraft airworthiness to be maintained.

Revision 1 rewrite the "Applicability" paragraph, in order to avoid a misunderstanding. The technical contents of the AD are not affected by this revision.

1. Within 500 flights hours following the Pitch Trim system maintenance check performed in accordance with the requirements of AD 2000-007-301(B). check for the integrity of the FCC/FAC as for the activation logic of the auto-trim function, by checking the correct operation of this function. Correct any anomaly noticed before the next flight following these findings, in accordance with the instructions of AIRBUS INDUSTRIE Service Bulletin (SB) A300-22A0115 Revision 02 or A310-22A2053 Revision 01 or A300-22A6042 Revision 01.

2. Repeat this procedure at intervals not exceeding 500 flights hours.

3. Inform AIRBUS INDUSTRIE of all findings, whatever they may be.

- AIRBUS INDUSTRIE SB: A300-22A0115 Revision 02

A310-22A2053 Revision 01

A300-22A6042 Revision 01

(or any other later approved revision)

- AD 2000-007-301(B) dated January 26, 2000

This Revision 1 replaces AD 2000-115-304(B) issued on March 08, 2000.

Original AD and Revision 1: MARCH 18, 2000