1 NOT INSTALLED ON ALL AIRPLANES
Precooler Control Valve System Inspection/Check Figure 602 (Sheet 1)
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 (5)  S 436-010Connect the -6 end of a TYPE A hose to the Precooler Control Valve supply pressure port.
 (6)  S 436-011Connect the -4 end of the TYPE A hose to Test Set Fitting No. 4. (See Fig. 602 Sheet 1)
 (7)  S 716-012Open the Test Set Shutoff Valve.
 (8)  S 716-013Turn the Primary Regulator knob clockwise until the Primary System Gauge indicates (50 | 5) psig.
 (9)  S 716-014Set the SYSTEM SELECTOR valve handle to the A position.
 S 716-015

 (10)
 Turn Pressure Regulator No. 1 clockwise until Test Set Gauge No. 3 indicates (12.0 | 2.0) psig.

 S 216-135

 (11)
 Use a mirror to examine the precooler control valve position indicator.

 (a)  
If the position indicator is within 30° of the full-CLOSED position, go to step G.(23).

 (b)  
If the position indicator is NOT within 30° of the full-CLOSED position, continue.

 S 716-016
 (12)
 Set the SYSTEM SELECTOR valve handle to the OFF position.

 S 026-017

 (13)
 Remove the TYPE A hose from the Precooler Control Valve supply port.

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 S 026-018
 (14)
 Remove the Precooler Sense Line from the right side of the Precooler Control Valve.

 S 426-019

 (15)
 Install the MS21902-6 Union in the Precooler Sense Line fitting.

 S 436-020

 (16)
 Connect the TYPE A hose to the Union.

 S 716-021

 (17)
 Turn Pressure Regulator No. 1 clockwise until Test Set Gauge No. 3 indicates (10.0) psig.

 S 216-136

 (18)
 Examine the 390°F thermostat, WTAI solenoid (If Installed), and associated fittings and lines for leakage.

 (a)  
If NO leakage is found, replace the precooler control valve (AMM 36-12-35/401), then go to step G.(40).

 (b)  
If leakage is found, replace and repair the damaged items as necessary, then continue.

 S 716-022
 (19)
 Set the SYSTEM SELECTOR valve handle to the OFF position.

 S 026-023

 (20)
 Remove the TYPE A hose from the Precooler Control Valve sense line.

 S 026-024

 (21)
 Remove the Union from the Precooler Control Valve sense line.

 S 436-025

 (22)
 Connect the TYPE A hose to the Precooler Control Valve supply pressure port.

 S 716-026

 (23)
 Turn Pressure Regulator No. 1 counter-clockwise until (0.0) psig is indicated on Test Set Gauge No. 3.

 (24)
 Set the SYSTEM SELECTOR valve handle to the OFF position.

 S 716-027
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 S 026-028
 (25) Remove these Test Set Caps:
 (a) Cap No. 1
 (b) Cap No. 5
 (c) Cap No. 6
 S 036-029
 (26) Disconnect the TYPE A hose from Test Set Fitting No. 4.
 S 436-030
 (27) Install a Cap on Test Set Fitting No. 4.
 S 436-031
 (28) Connect the TYPE A hose to Test Set Fitting No. 1.
　
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