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75-23-10-400-002 Installation of the Rotor Active Clearance Start
Bleed Valve (4038KS) 75-31-10-000-002 Removal of the Bleed Valve Fuel Gear Motor Assembly 75-31-10-400-002 Installation of the Bleed Valve Fuel Gear Motor
Assembly 75-32-10-000-002 Removal of the Variable Stator Vane (VSV) Actuators 75-32-10-400-002 Installation of the Variable Stator Vane (VSV)
Actuators 79-21-20-000-002 Removal of the Main Oil/Fuel Heat Exchanger 79-21-20-400-002 Installation of the Main Oil/Fuel Heat Exchanger
3. Job Set-up
__________ Subtask 71-00-00-869-202
A. Not Applicable
4. Procedure
_________ **ON A/C 001-049, 051-099, 101-105, 151-199, 201-211,
Subtask 71-00-00-790-053
A. Leakage at the Drain Mast CAUTION : NO LEAKAGE IS PERMISSABLE FROM THE FUEL MANIFOLD SHROUD DRAIN
_______
LINE.
NOTE : For identification of this specific drain line on affected engines
____
(Refer to 71-70-00).
(1) Safety precaution : WARNING : DO NOT LET THE HMU TEMPERATURE EXCEED 100 DEG.C (212
_______
DEG.F).
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NOTE : Hydromechanical Units (HMUs) that have fluorocarbon (Viton)
____ external seals (SB 73-015) can leak fuel for a short time when they are below 0 deg.C (32.00 deg.F) (Modification 1 and 2)
R (Ref. TASK 71-00-00-790-002). If the ambient temperature is below -40 deg.C (-40.00 deg.F) it is recommanded to heat the HMU (modification 1 and 2) to minimize leakage during starts per the following procedure :
(a) Heat the HMU housing with a suitable hot air blower (Keco GH100, Aerotech BT400-45 or equivalent) operating at 140 deg.C (284.00 deg.F) until the HMU housing temperature is greater than 25 deg.C
(77.00 deg.F).
NOTE : The HMU should be warm to the touch but not hot.
____
- If the fuel leakage stops in less than 5 minutes at idle, continue operation of the engine.
- If the fuel leakage continues after 5 minutes at idle, shut down the engine and repair the source of the leakage.
(2) Fuel leak at the aircraft drain mast assembly
(a) Non running engine (Static fuel leak) at the aircraft drain mast assembly:
1 If the fuel leakage rate is less than 60 drops per minute (180
_ ml/hr or 3 cc/min), no maintenance action is required.
2 If the fuel leakage rate is greater than 60 drops per minute
_
(180 ml/hr or 3 cc/min):
- start the engine (Ref. TASK 71-00-00-710-003)
- let the engine becomes stable at min idle for 5 minutes
- refer to leakage limits given in step (b).
NOTE : In the case of extreme cold weather condition (Outside
____ Air Temperature (OAT)<- 20 deg.C (- 4 deg.F)), fuel leaks from the drain mast (other than fuel manifold drain) may occur on a non-running engine and during engine start (cold engine condition). This leakage is expected to stop after a 5 minute warm-up at minimum idle.
(b) Running engine (Dynamic fuel leak) at the aircraft drain mast assembly (After a 5 minute warm-up at minimum idle):
1 If the fuel leakage rate is less than 60 drops per minute (180
_ ml/hr or 3 cc/min), no maintenance action is required.
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2 If the fuel leakage rate is greater than 60 drops per minute
_ (180 ml/hr or 3 cc/min), but less than 90 drops per minute (270 ml/hr or 4.5 cc/min), corrective action is required within 25 cycles.
3 If the fuel leakage rate is greater than 90 drops per minute
_ (270 ml/hr or 4.5 cc/min), do a leakage test (Ref. TASK 71-00-00-790-005).
(3) Oil leakage at the drain mast assembly:
(a) If the oil leakage rate at the drain mast assembly is less than 7 drops per minute (20 ml/hr or 1 cc/3 min), no maintenance action is required.
(b) If the oil leakage rate at the drain mast assembly is greater than 7 drops per minute (20 ml/hr or 1 cc/3 min), do a leakage test (Ref. TASK 71-00-00-790-005).
(4) Hydraulic leakage at the drain mast assembly (Ref. TASK 29-00-00-790-001). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM 动力装置 POWER PLANT 1(84)
