(c)  Check cabin pressurization outflow valve flight operation. When switch is held toward CLOSED or OPEN the valve will move accordingly. 1) Move and hold the manual outflow valve toggle switch to CLOSED and verify the
outflow valve moves toward the fully closed position in a smooth continuous manner by observing the valve position indicator. Check that the forward outflow valve light comes on. Visually check that the forward and aft outflow valves are fully closed.
2)  Move and hold the manual outflow valve toggle switch to OPEN and verify the outflow valve moves toward the fully open position in a smooth continuous manner by observing the valve position indicator. Check that the forward outflow valve light goes out. Visually check that the forward and aft outflow valves are fully open.
NOTE:  If a 10-61209-10 cabin pressure selector panel is installed, the outflow valve will move incrementally in the FLT mode with each toggle switch actuation. The toggle switch must be cycled in order to fully close or open the outflow valve.
3) Place FLT-GRD switch to GRD.
4) Select AC MAN OPEN and ensure that outflow valve is open.

NOTE:  During ground operation, outflow valve gate drop when switching from DC MAN to AC MAN is considered normal.
5)  If no longer required, remove electrical power from airplane.
6)  If the outflow valve moves in an erratic manner, as observed on the valve position indicator, replace the outflow valve (Ref 21-31-11 R/I).
C.  AC Manual Mode Test
(1)  
Prepare to test AC Manual Mode.

(a)  Refer to par. 1.B.(1).

(2)  
Test AC Manual Mode.

(a) Place mode selector switch to AC MAN and check that MANUAL light comes on.
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(b) Check cabin pressurization outflow valve ground operation. 1) Move and hold the manual outflow valve toggle switch to CLOSED and verify the outflow valve moves toward the fully closed position in a smooth continuous manner by observing the valve position indicator. Check that the forward outflow valve light comes on. Visually check that the forward and aft outflow valves are fully closed. 2) Move and hold the manual outflow valve toggle switch to OPEN and verify the outflow valve moves toward the fully open position in a smooth continuous manner by observing the valve position indicator. Check that the forward outflow valve light goes out. Visually check that the forward and aft outflow valves are fully open.
3)  Operate outflow valve toggle switch until VALVE position indicator is at about the center mark. 4) Place FLT-GRD switch to FLT.
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(c) Check cabin pressurization outflow valve flight operation. 1) Move and hold the manual outflow valve toggle switch to CLOSED and verify the outflow valve moves toward the fully closed position in a smooth continuous manner by observing the valve position indicator. Check that the forward outflow valve light comes on. Visually check that the forward and aft outflow valves are fully closed.
2)  Move and hold the manual outflow valve toggle switch to OPEN and verify the outflow valve moves toward the fully open position in a smooth continuous manner by observing the valve position indicator. Check that the forward outflow valve light goes out. Visually check that the forward and aft outflow valves are fully open.
NOTE:  If a 10-61209-10 cabin pressure selector panel is installed, the outflow valve will move incrementally in the FLT mode with each toggle switch actuation. The toggle switch must be cycled in order to fully close or open the outflow valve.
3) Place FLT-GRD switch to GRD.
4) With mode selector in AC MAN OPEN ensure that outflow valve is open.
5) Remove electrical power if no longer required.
6) If the outflow valve moves in an erratic manner, as observed on the valve

position indicator, replace the outflow valve (Ref 21-31-11 R/I).
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D.  Standby Mode Test
(1)  
Prepare to test Standby Mode.

(a)  
Refer to par. 1.B.(1).

(b)  
On airplanes without SB 21-1119, energize No. 1 air data computer by closing AIR DATA CMPTR circuit breakers on P18 circuit breaker panel.

(c)  
On airplanes with SB 21-1119, energize No. 2 air data computer by a closing AIR DATA CMPTR circuit breakers on P6 circuit breaker panel.
　
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