(a)  
AUTOMATIC AC and DC

 (b)  
STBY AC and DC

 (c)  
MAN AC and DC

 D. Procedure
 S 865-030
 (1)  Make sure that all cabin doors and windows are closed.
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 (2)  S 865-031Start and operate the air conditioning packs in MANUAL-COLD (AMM 21-00-00/201).
 (3)  S 865-032Set the CAB ALT adjustment to -500 feet.
 (4)  S 865-033Set the CABIN RATE selector to the vertical position.
 (5)  S 865-034Set the mode selector to STBY.
 (6)  S 865-035Set the FLT/GRD toggle switch to FLT.
 (7)  S 715-036Make sure that CABIN CLIMB becomes stable at 1000 |300 SL FEET PER MIN down before CABIN CLIMB stays near zero.
 (8)  S 865-037Set the FLT/GRD toggle switch to GRD.
 (9)  S 715-038Make sure that CABIN CLIMB becomes stable at 1000 |300 SL FEET PER MIN up before CABIN CLIMB shows near zero.
 S 865-039

 (10)
 Set the CABIN RATE selector to the triangle.

 S 865-040

 (11)
 Set the FLT/GRD switch to FLT.

 S 715-041

 (12)
 When the CABIN CLIMB becomes stable at 300 |100 SL FEET PER MIN down, set the CABIN RATE selector to the full DECR position.

 S 715-042

 (13)
 Make sure that CABIN CLIMB becomes stable at 50 |50 SL FEET PER MIN down before CABIN CLIMB stays near zero.

 S 865-043

 (14)
 Set the FLT/GRD switch to GRD.

 S 715-044

 (15)
 Let the CABIN CLIMB become stable at 50 to |50 SL FEET PER MIN up.

 S 865-045

 (16)
 Set the CABIN RATE selector to the triangle.

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737-300/400/500MAINTENANCE MANUAL
 S 715-046
 (17) Make sure that CABIN CLIMB becomes stable at 300 |100 SL FEET PER MIN up before CABIN CLIMB stays near zero.
 TASK 21-31-00-715-058
 5.  Standby Altitude Check______________________
 A. References
 (1)  
AMM 21-00-00/201, Air Conditioning

 (2)  
AMM 24-22-00/201, Electrical Power

 B. Access
 (1)  Location Zone
 101 Left Control Cabin
 102 Right Control Cabin

 C. Prepare for the test.
 S 865-047
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-048

 (2)
Make sure that these circuit breakers on the P6 panel are closed.

 (a)  
AUTOMATIC AC and DC

 (b)  
STBY AC and DC

 (c)  
MAN AC and DC

 D. Procedure
 S 865-049
 (1)  
Open a window in the flight compartment.

 S 865-050

 (2)  
Start and operate the air conditioning in MANUAL-COLD (AMM 21-00-00/201).

 S 865-051

 (3)  
Set the CAB ALT to 200 feet more than the field altitude.

 (4)  
Set the FLT/GRD switch to FLT.

 S 865-053

 (5)  
Adjust the CAB ALT down slowly until the outflow valve starts to close.

 S 865-054

 (6)  
Set the CAB ALT at the altitude that keeps outflow valve movement to a minimum.

 (7)
Make sure that CAB ALT shows the field altitude |120 feet.

 S 865-052
 S 715-055
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