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TASK 34-22-25-170-001
Draining and Flushing of the Standby Static and Standby Total Pressure lines (ISIS)
1. Reason for the Job
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Refer to the MPD TASK: 342100-02.
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To remove the water from the standby static pressure lines.
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To remove dust and particles from the standby static and standby total pressur lines.
2. Job Set-up Information
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A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking cap No specific dry nitrogen source - 2 bars (29 psi) No specific access platform 1.6 m (5 ft. 3 in.) 98D34003500000 2 ADAPTER COVER-STATIC PORT 98D34103002000 1 ADAPTERS - AIR DATA SYSTEM FLUSHING 98D34103004000 1 CLEANER - PITOT PROBE
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
12-24-34-600-001 Bleeding of the Standby Air Data System 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied
from the External Power 34-22-25-000-001 Removal of the ISIS Indicator (22FN) 34-22-25-400-001 Installation of the ISIS Indicator (22FN) 34-22-25-790-001 Low range Leak Test of the Standby Pneumatic circuits 34-22-25-991-002 Fig. 301
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3. Job Set-up
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(Ref. Fig. 301/TASK 34-22-25-991-002)
NOTE : The hose couplings are self-sealing.
____ Subtask 34-22-25-861-051
A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. TASK 24-41-00-861-002).
Subtask 34-22-25-010-051
B. Get Access
(1) Put the access platform in position in the zone 110 at the access door 811.
(2) Open the access door 811. Subtask 34-22-25-020-052
C. Aircraft Maintenance Configuration
(1)
Drain the standby air data system (Ref. TASK 12-24-34-600-001).
(2)
Disconnect the quick-disconnect coupling (4) from the ADM 19FP8 and the quick-disconnect coupling (8) from the ADM 19FP3.
(3)
Disconnect the cabin-pressure detection pressure-switch 14WN (3) from the static line. Put a blanking cap on the pressure switch.
(4)
Remove the water drain plug (2) from the water drain (1).
(5)
In the cockpit, on the center instrument panel:
-remove the ISIS indicator 22FN (Ref. TASK 34-22-25-000-001)
(6)
Disconnect the quick-disconnect coupling (7) from the red 2-pin coupling and disconnect the quick-disconnect coupling (5) from the yellow 3-pin coupling of the ISIS indicator 22FN (6).
(7)
Connect a ADAPTERS - AIR DATA SYSTEM FLUSHING 3-pin adapter (98D34103002100) ) to the hose (5) and a ADAPTERS - AIR DATA SYSTEM FLUSHING 2-pin adapter (98D34103002102) to the hose (7). Then connect to the dry nitrogen source - 2 bars (29 psi).
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Pressure lines
Figure 301/TASK 34-22-25-991-002
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(8) Attach the hoses to prevent movement.
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4. Procedure
Subtask 34-22-25-170-050
A. Draining and Flushing of the Standby Static and the Standby Total
Pressure Lines
(1)
Blow the gas into the hoses (5) and into the hose (7), from one to the other, at a pressure of 2 bars (29 psi). Do this for approximately 5 minutes.
(2)
Clean draining hole of the pitot probe 3 with CLEANER - PITOT PROBE
(3)
Make sure that there is no contamination in the pressurized gas at these outlets:
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