Remarks: Where applicable, the requirements of this AD must be integrated into the Aircraft's Logbook(s). 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.

A310 and A300-600 Aircraft

Airbus A310 and A300-600 aircraft equipped with JT9D-7R4 or P&W 4000 series engines.

This Airworthiness Directive is prompted by a recent event of Thrust Reverser in flight deployment on an A300-600 aircraft equipped with P&W 4158 engines.

This condition, if not corrected could impair the flight controllability of the aircraft.

Telegraphic Airworthiness Directive No T98-477-273(B) was issued to prevent such situations from recurring by requiring the mandatory de-activation of the thrust reversers. Revision 1 of this Airworthiness Directive allowed the re-activation of the thrust reverser under certain conditions based on the findings of the event investigation.

Further to additional investigation results which led to the refining of the conditions required for re-activating the thrust reverser and keeping it re-activated, this Airworthiness Directive re-defines the thrust reversers "de-activation/re-activation program".

To prevent an in flight Thrust Reverser deployment accomplish the following :

a) Thrust Reversers de-activation :

Before departure from Main Base or within the next four (4) flight cycles following the effective date of this AD, whichever occurs first, deactivate both Thrust Reversers in accordance with the instructions given in paragraph 4.2 of AIRBUS INDUSTRIE All Operators Telex (AOT) 78-08, November 30,1998.

b) Thrust Reversers re-activation :

Reactivation of a Thrust Reverser is only allowed under the following conditions:

1. Reinforce the Stow Selection, and periodically inspect the Selector Valve in accordance with the terms and conditions of paragraph 4.2.1.1 of AIRBUS INDUSTRIE AOT 78-09 REV 02/22 April 1999.

2. Reinforce the protection of the Thrust Reverser against power supply loss in accordance with the terms and conditions of paragraph 4.2.1.2 of AIRBUS INDUSTRIE AOT 78-09 REV 02/22 April 1999.

3. Reinforce the protection against inadvertent pressurization of the Thrust Reverser in accordance with the terms and conditions of paragraph 4.2.1.3 of AIRBUS INDUSTRIE AOT 78-09 REV 02/22 April 1999.

4. Perform a Thrust Reverser Aerostow seal check and a Power Drive Unit (PDU) check, in accordance with the terms and conditions of paragraph 4.2.1.4 of AIRBUS INDUSTRIE AOT 78-09 REV 02/22 April 1999.

5. Perform a Thrust Reverser operational Test in accordance with the terms and conditions of paragraph 4.2.1.5 of AIRBUS INDUSTRIE AOT 78-09 REV 02/22 April 1999.

a) Operational Recommendations :

i) With both Thrust Reverser deactivated, follow the Operational recommendations described in AIRBUS INDUSTRIE Flight Operation Telex (FOT) 999.0124/98 Revision 3, December 10,1998.

ii) When, and if, Thrust Reverser(s) is/are reactivated, follow the Operational recommendations described in AIRBUS INDUSTRIE FOT 999.0140/98, December 23,1998.

b) Inquiries regarding the technical content of this AD should be made to :

DGAC France - Jean BEIJARD

Tel.: (33) 01 41 09 42 29 - Fax: (33) 01 41 09 42 20

or to

AIRBUS INDUSTRIE - Yves REGIS

Tel.: (33) 05 61 93 31 81 - Fax: (33) 05 61 93 45 80

AIRBUS INDUSTRIE All Operators Telex (AOT) 78-08 November 30,1998

AIRBUS INDUSTRIE All Operators Telex (AOT) 78-09 REV 02/22 April 1999

AIRBUS INDUSTRIE Flight Operation Telex (FOT) 999.0124/98 Revision 3 December 10,1998

AIRBUS INDUSTRIE Flight Operation Telex (FOT) 999.0140/98 December 23,1998

This Airworthiness Directive replaces AD 1998-477-273(B) R1 which is cancelled by its Revision 2.

EFFECTIVE DATE: MAY 15, 1999