Airbus

Topics: Airbus A320 family, Airbus A340, Airbus Pages: 3 (668 words) Published: July 22, 2013
Technical Follow-Up
PAGE 1/2 TFU REF : 21.60.00.007
OWNER/EXT : J.BRAUD Tel : +33 561180038 E-Mail : jerome.braud@airbus.com

Issue with actuator PN 9069 fitted on ECS electro-actuated valves A/C Affected : A318, A319, A320, A321, A330, A340, A340-500, A340-600 Engine Affected : FAIR-ISP Item : 10.0154

TFU STATUS : OPEN
TFU ISSUE DATE TFU FIRST ISSUE DATE TFU NEXT ISSUE DATE ISSUE NB : : : : JUN 2013 AUG 2011 AUG 2013 08

DESCRIPTION : Operators are reporting an increase number of removals for Environmental Control System (ECS) electrically actuated valves: By Pass Valves (BPV) and Trim Air Valves (TAV). This is also reported on the LR family aircraft for the TAV. For SA A/C family, the following PNs are affected: - BPV 1312A/B, 758A - TAV 1320A, 963A/B, 750A/B. For LR family A/C, the following PNs are affected: - TAV 1320A, 963A/B.

IMPACTS CLASSIFICATION Impact on Impact on Impact on Impact on Effect on Category Impact on flight OPS line maintenance shop maintenance environment flight PAX comfort : : : : : : : Low Medium Medium None None Economic Low

RELEVANT DOCUMENTATION Airbus OPS documentation

Airbus Maintenance documentation

Other documentation

CONSEQUENCE : The valve failure can generate: - PACK REGUL FAULT ECAM Warning associated to Bypass valve fault message when BPV is faulty, - COND TRIM SYST FAULT Ecam Warning associated to Trim Air Valve failure message when TAV is faulty. Associated ECAM Warning generation leads to MEL application and corresponding valve de-activation INVESTIGATION STATUS : Investigations have revealed that the actuators PN 9069 were most of the time at the origin of the removals. A thermal analysis has been done to determine the impact of environmental temperature on motor operation and ageing behaviour. Based on these investigations, it has been identified that a temperature effect could affect the motor and thus causes the actuator failure. High temperature is at the origin of material degradation which...
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