A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized (Ref. TASK 24-42-00-861-001).
Subtask 21-55-51-865-051
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR COND/RAM/AIR/INLET 1HZ D10
Subtask 21-55-51-010-051
C. Get Access
(1) Make sure that the access platform is in position at the access panel 191AB.
(2) Make sure that the access panel 191AB is removed.
4. Procedure_________
(Ref. Fig. 401/TASK 21-55-51-991-001)
Subtask 21-55-51-420-050
A. Installation of the Actuator
(1) Clean the component interface and/or the adjacent area.
(2) Do an inspection of the component interface and/or the adjacent area.
R R (3) Make sure that the length of the actuator (15) between the pivot point centers is 372.0 +1.0 -1.0 mm (14.6456 +0.0393 -0.0393 in.).
R (4) Install the washers (7) and the bushings (6) and put the actuator (15) in position.
R (5) Install the washer (4) and the bolt (5).
R (6) Install the washer (3).
R (7) Install the nut (2) and tighten it.
R (8) Install the bolt (14).
R (9) Install the washer (12).
R (10) Install the nut (13) and tighten it.
R (11) Lock the nuts (2) and (13) with the new cotter pins (1).
R (12) Remove the blanking caps from the electrical connectors.
R (13) Make sure that the electrical connectors are clean and in the correct condition.
R (14) Connect the electrical connector (16).
R (15) Connect the bonding strip (9).
(a) Install the washer (10) and the screw (11).
(b) Install the nut (8) and tighten it.
Subtask 21-55-51-865-052
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1HZ
Subtask 21-55-51-710-050
C. Do an operational test of the emergency ram air inlet (Ref. TASK 21-55-00-710-001).
5. Close-up________
Subtask 21-55-51-410-050
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Install the access panel 191AB.
(3) Remove the access platform(s).
Subtask 21-55-51-862-050
B. De-energize the ground service network (Ref. TASK 24-42-00-862-001).
TEMPERATURE CONTROL - DESCRIPTION AND OPERATION
_______________________________________________
1. General
_______ (Ref. Fig. 001) The Environmental Control System (ECS) maintains and controls the zone temperatures and the ventilation rate for the two passenger zones and the flight deck. It also supplies conditioned air to the cargo compartment. For this, two air conditioning packs are installed in the unpressurized area in the belly fairing. The packs are supplied with preconditioned air from the main engines, from the APU or from a ground source.
The main part of the cooling system is a 3-wheel air-cycle machine which works as a boot-strap system for heating and cooling. A high pressure water seperation is installed to take full advantage of available bleed pressures and recirculation capability. The system control is done by eletronic controllers, electro-pneumatic valves and electrically driven valves. For sufficient ventilation and passenger comfort a common cold air manifold mixes the pack fresh air with recirculated air.
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