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MAINTENANCE MANUAL
(8) S 214-017Make sure the cabin altimeter needle points to field elevation | 125 feet.
(9) S 214-018Make sure the differential pressure needle points to 0 |0.15 psi.
S 214-019
(10) Remove electrical power, if it is not necessary (Ref 24-22-01).
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DIFFERENTIAL PRESSURE SENSOR - REMOVAL/INSTALLATION
___________________________________________________
1. General_______
A. This procedure contains two tasks. The first task is the removal of the differential pressure sensor. The second task is the installation of the differential pressure sensor.
B. The differential pressure sensor changes the ambient pressure signals from the pitot-static system into electrical signals for the differential pressure indicator. The sensor is on the left side of the forward equipment bay and it is connected to the pitot static tubing.
TASK 21-33-04-004-001
2. Remove the Differential Pressure Sensor (Fig. 401)_______________________________________
A. References
(1)
06-41-00/201, Fuselage Access Doors and Panels
B.
Access
(1)
Location Zones
119/120 Forward Equipment Bay
(2)
Access Panel
119BL Forward Equipment Bay Access Door
C.
Procedure
S 864-002
(1)
Open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:
(a)
11B12, CABIN DIFF PRESS IND
(b)
11B13, CABIN ALTM
S 014-003
(2)
Open the forward equipment bay access door (119BL) and find the differential pressure sensor (Ref 06-41-00).
S 034-004
(3)
Disconnect the electrical connector from the differential pressure sensor.
(4)
Loosen the coupling nut from the tee connector.
(5)
Remove the coupling nut from the sensor.
S 034-005
S 034-006
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Differential Pressure Sensor Installation
Figure 401
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S 024-007
(6) Remove the differential pressure sensor from the tee connector.
TASK 21-33-04-404-008
3. Install the Differential Pressure Sensor (Fig. 401)________________________________________
A. References
(1)
06-41-00/201, Fuselage Access Doors and Panels
(2)
24-22-00/201, Electrical Power-Control
B.
Access
(1)
Location Zones
119/120 Forward Equipment Bay
(2)
Access Panel
119BL Forward Equipment Bay Access Door
C.
Procedure
S 424-009
CAUTION: MAKE SURE THE DIFFERENTIAL PRESSURE SENSOR AND THE
_______ PRESSURIZATION AND INDICATION WARNING MODULE ARE CORRECT TO USE TOGETHER. LOOK AT THE ILLUSTRATED PARTS CATALOG TO MAKE SURE YOU HAVE THE CORRECT PART NUMBER EFFECTIVITY FOR THE TWO COMPONENTS WHEN YOU REPLACE A COMPONENT. IF THE COMPONENTS ARE NOT CORRECT, AN INCORRECT INDICATION CAN OCCUR.
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