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 S 975-248
 (7)  AIRPLANES WITH THE PRIMARY HEAT EXCHANGER OUTLET TEMPERATURE DISPLAY; Make a record of the PRIM HX OUT display on the ECS maintenance page as T2.
 S 975-507
 (8)  AIRPLANES WITHOUT THE PRIMARY HEAT EXCHANGER OUTLET TEMPERATURE DISPLAY; Measure the surface temperature of the outlet duct for the primary heat exchanger. (a) Make a record of the primary heat exchanger outlet temperature as T2.
 S 975-249
 (9)  If the difference between T1 and T2 is more than 22 deg. C (40 deg. F), then the primary heat exchanger is OK.
 S 715-250

 (10)
 If the difference between T1 and T2 is less than 22 deg. C (40 deg. F), then do this step:

 (a)  
Replace the primary heat exchanger (AMM 21-51-02/401).

 S 975-262
 (11)
 AIRPLANES WITH THE COMPRESSOR OUTLET TEMPERATURE DISPLAY; Make a record of the COMP OUT display on the ECS maintenance page as T3.

 S 975-508

 (12)
 AIRPLANES WITHOUT THE COMPRESSOR OUTLET TEMPERATURE DISPLAY; Measure the surface temperature of the inlet duct for the secondary heat exchanger.

 (a)  
Make a record of the secondary heat exchanger inlet temperature as T3.

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757 MAINTENANCE MANUAL
 S 975-251
 (13)
 AIRPLANES WITH THE SECONDARY HEAT EXCHANGER OUTLET TEMPERATURE DISPLAY; Make a record of the SEC HX OUT display on the ECS maintenance page as T4.

 S 975-509

 (14)
 AIRPLANES WITHOUT THE SECONDARY HEAT EXCHANGER OUTLET TEMPERATURE DISPLAY; Measure the surface temperature of the outlet duct for the secondary heat exchanger.

 (a)  
Make a record of the secondary heat exchanger inlet temperature as T4.

 S 975-252
 (15)
 If the difference between T3 and T4 is less than 125 deg. C
 (225 deg. F), then the secondary heat exchanger is OK.

 S 975-253

 (16)
 If the difference between T3 and T4 is more than 125 deg. C
 (225 deg. F), then do the applicable step:

 

 NOTE:____The primary and secondary heat exchangers are in series. If the difference between T3 and T4 is more than 125 deg C (225 deg F) then the system performance is degraded.
 (a)  
Clean the secondary exchanger (AMM 21-51-02/701).

 (b)  
Replace the secondary heat exchanger (AMM 21-51-02/401).

　
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