O. Standby System Scheduling Voltage (Test Pin P or Test Jack 14) Auto System Scheduling Voltage (Test Pin R or Test Jack 15)
CAUTION: ASSURE THAT VOLTMETER IS IN THE DC VOLTS POSITION BEFORE CHECKING TEST PINS P AND R OR TEST JACKS 14 AND 15 TO PREVENT DAMAGE TO PRESSURE CONTROLLER.
(1)
Record voltage at test pin P or test jack 14.
(2)
Record voltage at test pin R or test jack 15.
NOTE: The difference between the voltages recorded at test pins P and R or test jacks 14 and 15 should be no more than 0.5 volt dc.
3. Standby Rate Check
A. Check that all cabin doors and sliding windows are closed.
B. Start and operate air cycle packs in MANUAL-COLD (Ref 21-00 MP).
C. Set CAB ALT to -500 feet.
D. Set CABIN RATE selector to vertical position.
E. Set mode selector to STBY.
F. Set FLT/GRD toggle switch to FLT. Check that CABIN CLIMB stabilizes at 1000 +300 SL FEET PER MIN down before moving near zero.
G. Set FLT/GRD toggle switch to GRD. Check that CABIN CLIMB stabilizes at 1000 +300 SL FEET PER MIN up before moving near zero.
H. Set CABIN RATE selector to pip mark.
I. Set FLT/GRD switch to FLT. When CABIN CLIMB stabilizes at 300 +100 SL FEET PER MIN down, set CABIN RATE selector to full DECR position. Check that CABIN CLIMB stabilizes at 50 +50 SL FEET PER MIN down before moving near zero.
J. Set FLT/GRD switch to GRD. When CABIN CLIMB stabilizes at 50 +50 SL FEET PER MIN up, set CABIN RATE selector to pip mark. Check that CABIN CLIMB stabilizes at 300 +100 SL FEET PER MIN up before moving near zero.
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4. Standby Altitude Check
A. Open sliding window in flight compartment.
B. Start and operate air cycle packs in MANUAL-COLD (Ref 21-00 MP).
C. Set CAB ALT to 200 feet above field elevation.
D. Set FLT/GRD switch to FLT and reset CAB ALT down slowly until outflow valve starts to close.
E. Set CAB ALT in position at which outflow valve movement is minimized. Check that CAB ALT reads field elevation + 120 feet.
F. Set FLT/GRD switch to GRD.
G. Close sliding window in flight compartment.
5. Auto Rate Check
A. Start and operate air cycle packs in MANUAL-COLD (Ref 21-00 MP).
B. Set mode selector to AUTO.
C. Set FLT/GRD switch to FLT. Check that CABIN CLIMB stabilizes at 250 to 450 SL FEET PER MIN down before moving near zero.
D. Set FLT/GRD switch to GRD. Check that CABIN CLIMB stabilizes at 300 to 600 SL FEET PER MIN up before moving near zero.
E. Restore airplane to normal.
6. Pressurization Outflow Valve Resistance Tests
A. Remove outflow valve (Ref 21-31-11 R/I).
B. At connectors D950 (AC clutch) and D952 (DC clutch), check that resistance between pins 6 and 7 is 21 ±3 ohms and resistance between pins 8 and 11 is 10 ±1.5k.
C. Replace the outflow valve if any resistance measurements are out of tolerance.
D. Install the outflow valve (Ref 21-31-11 R/I).
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21-31-0 Page 515
CABIN PRESSURIZATION OUTFLOW VALVE -REMOVAL/INSTALLATION
1. General
A. The cabin pressurization outflow valve is removed and installed from outside the airplane. It is located under the fuselage approximately opposite the aft entry door.
2. Equipment and Materials
A. Bit -Apex 212-5/16 inch
B. Methyl Ethyl Ketone (20-30-31) or
C. Isopropyl Alcohol (20-30-31)
D. PROSEAL 898 (B-1/2 or B-2) (20-30-11, BMS 5-79)
E. Spatula or flow gun
3. Remove Cabin Pressurization Outflow Valve
A. Open the six PRESSURIZATION CONTROL and one OUTFLOW VALVE HEATER, if installed circuit breakers on P6-4.
WARNING: ACTUATION OF OUTFLOW VALVE DURING REMOVAL/INSTALLATION COULD CAUSE INJURY TO PERSONNEL.
B. Locate three screwheads forward of outflow valve and three screwheads aft of outflow valve.
C. Insert bit in each screwhead and rotate counterclockwise until stop point is reached.
C. Press upward and aft against aft end of outflow valve, rotating it about l/4-turn.
D. Reach through opening and disconnect electrical connectors on forward side of each actuator.
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