Draining and Flushing of Standby Pneumatic Circuits

TASK 34-10-00-170-003-A
Draining and Flushing of Standby Pneumatic Circuits

CAUTION: BEFORE YOU DO THE FLUSHING AND/OR DRAINING, MAKE SURE THAT:

YOU DISCONNECT THE QUICK-DISCONNECT COUPLINGS OF THE ADM'S
YOU REMOVE THE STANDBY ALTIMETER AND THE STANDBY AIRSPEED INDICATOR.

IF YOU DO NOT OBEY THESE INSTRUCTIONS, DAMAGE TO THESE COMPONENTS CAN OCCUR DURING THE FLUSHING AND/OR DRAINING.

ZONE: 120
FIN: 19FP3 ** ON A/C NOT FOR ALL
FIN: 19FP8 ** ON A/C NOT FOR ALL

1. Reason for the Job
Refer to the MPD TASK: 342100-02
DRAINING AND FLUSHING OF STANDBY PNEUMATIC CIRCUITS
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	NITROGEN COMPRESSED SOURCE 2 BAR (29 PSI) - DRY
No specific	AR	PLUG - BLANKING
No specific	AR	WIRE DIA 0.6 MM (0.024 IN) - NYLON
No specific	AR	WIRE DIA 0.7 TO 0.8 MM ((0.028 TO 0.032 IN) - NYLON
No specific	Torque wrench: range to between 7.05 and 6.95 m.N (62.39 and 61.50 lbf.in )
98D34003500000	2	ADAPTER COVER-STATIC PORT
98D34103002000	1	ADAPTERS - AIR DATA SYSTEM FLUSHING
98D34103004001	1	CLEANER-PITOT PROBE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
120	AVIONICS COMPARTMENT
811

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
12	O-RING	AIPC 52-73-01-02-030

D. Referenced Information

REFERENCE	DESIGNATION
TASK 10-11-00-555-013-A	Installation of the Aircraft Protection Equipment
TASK 10-11-00-555-014-A	Removal of the Aircraft Protection Equipment
TASK 12-24-34-600-001-A	Bleeding of the Standby Air Data System
TASK 34-21-00-790-001-A	Low-Range Leak Test of the Standby Pneumatic Circuits
TASK 34-21-22-000-001-A	Removal of the Standby Altimeter
TASK 34-21-22-400-001-A	Installation of the Standby Altimeter
TASK 34-21-25-000-001-A	Removal of the Metric Altimeter
TASK 34-21-25-400-001-A	Installation of the Metric Altimeter
TASK 34-21-26-000-001-A	Removal of the Standby Airspeed Indicator
TASK 34-21-26-400-001-A	Installation of the Standby Airspeed Indicator
Locations of the Components Related to the Standby Pressure Line
Routing of the Pressure Lines
Cabin-Pressure Detection Pressure-Switch 14WN - Static Line and Restrictor
Water Drain Plug
Connection of the Quick-Disconnect Coupling

3. Job Set-up

NOTE: The hose couplings are self-sealing.

Subtask 34-10-00-010-061-A ** ON A/C NOT FOR ALL

A. Get Access
(1) Put the ACCESS PLATFORM 1M(3 FT) in position in the zone 110 at the access door 811.
(2) Open the access door 811.

Subtask 34-10-00-860-053-B ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) If the aircraft protection equipment is installed, remove it (Ref. AMM TASK 10-11-00-555-014).
(2) Drain the standby air-data system (Ref. AMM TASK 12-24-34-600-001).
(3) Disconnect the quick-disconnect coupling (4) from the standby static pressure Air Data Module (ADM) 19FP8 and the quick-disconnect coupling (10) from the standby total pressure ADM 19FP3.
(4) Disconnection of the static line (14):

Cabin-Pressure Detection Pressure-Switch 14WN - Static Line and Restrictor ** ON A/C NOT FOR ALL

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE RESTRICTOR WHEN YOU DISCONNECT/CONNECT THE STATIC LINE. IF YOU DO NOT USE A SECOND WRENCH, YOU CAN CAUSE DAMAGE TO THE PRESSURE SWITCH AND/OR THE STATIC LINE.

(a) Disconnect the static line (14) from the restrictor (13).
(b) Remove the restrictor (13) and the O-ring (12) from the cabin-pressure detection pressure-switch 14WN (11).
(c) Remove the O-ring (12) from the restrictor (13) and discard the O-ring (12).
(d) Put the PLUG-BLANKING in each disconnected line end.
(5) Remove the water drain plug (2) from the water drain (1).

Water Drain Plug ** ON A/C NOT FOR ALL

(6) In the cockpit, on left center instrument-panel 401VU:
(a) Remove the standby altimeter 3FN (7) (Ref. AMM TASK 34-21-22-000-001).
(b) Remove the standby airspeed indicator 9FN (8) (Ref. AMM TASK 34-21-26-000-001).
(c) Remove the metric altimeter 15FN (6) (Ref. AMM TASK 34-21-25-000-001).
(7) Connection of the hoses:
(a) Connect the 3-pin adapter (98D34103002100) of the 98D34103002000 ADAPTERS - AIR DATA SYSTEM FLUSHING to the hose (5) of the standby altimeter 3FN (7).
(b) Connect the 2-pin adapter (98D34103002102) of the 98D34103002000 ADAPTERS - AIR DATA SYSTEM FLUSHING to the hose (9) of the standby airspeed indicator 9FN (8).
(c) Connect the hoses to the NITROGEN COMPRESSED SOURCE 2 BAR (29 PSI) - DRY.
(8) Attach the hoses to prevent movement.

4. Procedure
Subtask 34-10-00-170-052-F ** ON A/C NOT FOR ALL

A. Draining and Flushing of the Standby Total Pressure-Lines
(1) Blow the gas into the instrument hose (9), at a pressure of 2 -0.35 bar or +0.35 bar (29 -5 psi or +5 psi). Do this for approximately five minutes.
(2) Clean the draining hole of pitot probe 3 with the 98D34103004001 CLEANER-PITOT PROBE and:

The WIRE DIA 0.6 MM (0.024 IN) - NYLON
Then, the WIRE DIA 0.7 TO 0.8 MM ((0.028 TO 0.032 IN) - NYLON.

NOTE: The nylon wire must be 5 mm (0.197 in.) long to make sure that it does not touch the metal tool element and the pitot probe.

(3) Make sure that there is no contamination in the pressurized gas for the outlets that follow:

Air data module 19FP3 (10)
Pitot probe 3.

(4) Stop the flow of gas.

Subtask 34-10-00-170-063-A ** ON A/C NOT FOR ALL

B. Draining and Flushing of the Standby Static Pressure-Lines
(1) Blow the gas into each of the instrument hoses (5), one after the other, at a pressure of 2 -0.35 bar or +0.35 bar (29 -5 psi or +5 psi). Do this for approximately five minutes.
(2) Make sure that there is no contamination in the pressurized gas for the outlets that follow:

Left static probe 3 and right static probe 3
Air data module 19FP8 (4)
The water drain (1)
The pipe of the cabin-pressure detection pressure-switch (3).

(3) Put the 98D34003500000 ADAPTER COVER-STATIC PORT on left static probe 3 and on right static probe 3.
(4) Make sure that the flow of gas is correct for:

The pipe of the cabin-pressure detection pressure-switch (3)
The water drain (1).

(5) Stop the flow of gas.

Subtask 34-10-00-860-054-B ** ON A/C NOT FOR ALL

C. Put the aircraft back to its initial configuration.
(1) Disconnect the NITROGEN COMPRESSED SOURCE 2 BAR (29 PSI) - DRY.
(2) Removal of the adapters:
(a) Disconnect the 2-pin adapter (98D34103002102) of the 98D34103002000 ADAPTERS - AIR DATA SYSTEM FLUSHING from the hose (9) of the standby airspeed indicator 9FN (8).
(b) Disconnect the 3-pin adapter (98D34103002100) of the 98D34103002000 ADAPTERS - AIR DATA SYSTEM FLUSHING from the hose (5) of the standby altimeter 3FN (7).
(3) Install the water drain plug (2) on the water drain (1).

Water Drain Plug ** ON A/C NOT FOR ALL

(4) Connection of the static line (14):

Cabin-Pressure Detection Pressure-Switch 14WN - Static Line and Restrictor ** ON A/C NOT FOR ALL

(a) Remove the PLUG-BLANKING from each disconnected line end.
(b) Install the new AIPC 52-73-01-02-030 O-RING (12) or the new AIPC 52-73-01-02-030 O-RING (12) on the restrictor (13).
(c) Install the restrictor (13) on the cabin-pressure detection pressure-switch 14WN (11).
(d) TORQUE the restrictor (13) to between 7.05 and 6.95 m.N (62.39 and 61.50 lbf.in )

.
(e) Install the static line (14) on the restrictor (13).

(f) Tighten the static line (14).
(5) Connect the quick-disconnect coupling (10) to the standby total pressure ADM 19FP3 and the quick-disconnect coupling (4) to standby static pressure ADM 19FP8.

Connection of the Quick-Disconnect Coupling ** ON A/C NOT FOR ALL

(6) Make sure that you can see the blue ring on the quick-disconnect couplings (4) and (10).
(7) Pull the quick-disconnect couplings to make sure that they are correctly attached.
(8) In the cockpit, on left center instrument-panel 401VU:
(a) Install the metric altimeter 15FN (6) (Ref. AMM TASK 34-21-25-400-001).
(b) Install the standby airspeed indicator 9FN (8) (Ref. AMM TASK 34-21-26-400-001).
(c) Install the standby altimeter 3FN (7) (Ref. AMM TASK 34-21-22-400-001).
(9) Release the hoses.
(10) Tell a second approved mechanic to do a visual inspection of the quick-disconnect fitting connection only (the signatures of the two mechanics are mandatory).
(11) If you removed the aircraft protection equipment, install it (Ref. AMM TASK 10-11-00-555-013).

Subtask 34-10-00-790-052-A ** ON A/C NOT FOR ALL

D. Leak test
(1) Do a leak test of the standby air-data system
(Ref. AMM TASK 34-21-00-790-001).

5. Close-up
Subtask 34-10-00-410-061-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(3) Close the access door 811.
(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 04:02:24 UTC