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 1) Use the table 'HPTCC TIMER SEQUENCE OPERATION CHANGES'
 (Fig. 501). 2) Use a stop watch to measure the HPTCC timer sequence. 3) Start the stop watch and move the forward thrust levers to
 the minimum idle position, when the LED display on the control box changes from OFF-OFF to ON-OFF.
 4) Make a record of the time in the table, when the LED display on the control box changes from ON-OFF to ON-ON. 5) Make a record of the time in the table, when the LED display on the control box changes from ON-ON to OFF-ON. 6) Make a record of the time in the table, when the LED display on the control box changes from OFF-ON to OFF-OFF.
 NOTE: The HPTCC timer sequence must stop after 3 minutes.
____
 (f)  If the timer does not operate correctly, do the steps that follow: 1) Do an engine shutdown (AMM 71-00-00/201).
 a) Wait for the engine to become cool.
 2) Open the fan cowl panels (AMM 71-11-02/201).

 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE
_______ THRUST REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU OPEN THE THRUST REVERSERS, INJURY TO PERSONS OR DAMAGE TO THE EQUIPMENT CAN OCCUR.
 3) Open the thrust reverser (AMM 78-31-00/201). 4) Turn the adjustment screw on the HPTCC timer clockwise to increase, or counterclockwise to decrease, the timer speed.
 NOTE: One turn is equal to 1.8 seconds.
____
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 75-24-00
 ALL  ú ú C02 Page 504 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(TCC VALVE POSITION) SWITCH POINT SEQUENCE  ILLUMINATION LED  SEQUENCE MUST CHANGE BETWEEN THESE TIMES  ACTUAL RECORDED 
5TH STAGE CLOSED 9TH STAGE CLOSED TIMER ACTIVATION  ON OFF  0-8 SECONDS 
5TH STAGE OPEN 9TH STAGE CLOSED SEQUENCE 1  ON ON  8-152 SECONDS 
5TH STAGE OPEN 9TH STAGE OPEN SEQUENCE 2  ON OFF  152-182 SECONDS 
5TH STAGE CLOSED 9TH STAGE OPEN SEQUENCE 3  OFF OFF  MORE THAN 182 SECONDS 

TIMER SEQUENCE OPERATION CHANGES

High Pressure TCC (HPTCC) Valve and Timer Sequence
Figure 501 (Sheet 1)

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 75-24-00
 ALL  ú
 ú  C01  Page 505
 ú  Jul 15/95 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SLOW ACCELERATION TO 97% N2 RPM 
SWITCH POINT SEQUENCE (TCC VALVE POSITION)  LED ILLUMINATION  BETWEEN THESE RPM'S SEQUENCE MUST CHANGE  RECORDED ACTUAL 
BEGIN SEQUENCE 9TH STAGE OPEN 5TH STAGE CLOSED  OFF OFF  IDLE SPEED 
SEQUENCE 1 9TH STAGE OPEN 5TH STAGE OPEN  OFF ON  (79.6-80.9%) 11513-11703 
SEQUENCE 2 9TH STAGE CLOSED 5TH STAGE OPEN  ON ON  (82.6-84.5%) 11939-12223 
SEQUENCE 3 9TH STAGE OPEN 5TH STAGE OPEN  ON OFF  13240-13312 (91.6-92.3%) 
SEQUENCE 4 9TH STAGE OPEN 5TH STAGE CLOSED  OFF OFF  (95.3-95.8%) 13777-13849 
SLOW DECELERATION TO GROUND IDLE FOR 3 MINUTES 
SWITCH POINT SEQUENCE (TCC VALVE POSITION)  LED ILLUMINATION  BETWEEN THESE RPM'S SEQUENCE MUST CHANGE  RECORDED ACTUAL 
BEGIN SEQUENCE 9TH STAGE OPEN 5TH STAGE CLOSED  OFF OFF  97% OF N2 RPM 
SEQUENCE 1 9TH STAGE OPEN 5TH STAGE OPEN  OFF ON  (94.1-95.0%) 13612-13730 
SEQUENCE 2 9TH STAGE CLOSED 5TH STAGE OPEN  ON ON  (90.4-91.3%) 13075-13193 
SEQUENCE 3 9TH STAGE OPEN 5TH STAGE OPEN  ON OFF  (80.8-83.7%) 11679-12105 
SEQUENCE 4 9TH STAGE OPEN 5TH STAGE CLOSED OFF OFF  (77.8-80.1%) 11252-11584 

High Pressure Turbine Clearance Control (HPTCC) Valve and Timer Sequence Figure 501 (Sheet 2)
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