Equipment list operational and

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SYSTEM & SEQUENCE NUMBERS

REMARKS OR EXCEPTIONS

21 AIR CONDITIONING
4. Pac Isolation Valve

(M) May be inoperative provided:

a) Isolation valve is verified CLOSED,

b) Both PAC's are operative,

c) The APU is operative, and

d) Aircraft is operated at or below FL410.

MAINTENANCE PROCEDURES

(To verify Isolation Valve is closed, both PACs operative, and APU is operative)
Refer to Procedures Guide Appendix pages A-3 (Air Distribution Flow Diagram) while performing this procedure.
NOTE: The following procedure requires use of airplane engines. Locate the airplane in an engine run up area.
1. Set parking brake with antiskid off.

2. Start the right engine per checklist procedures

and set idle power.

(a) Place the isolation valve switch on the environmental control panel to the CLSD position. Set APU BLEED AIR switch to OFF.

(b) Place the CAB PAC in the ON position. Place the CKPT PAC to the ON position.

(d) Verify the isolation valve is closed by ensuring no airflow is present at the pilot and co-pilot's footwarmer ducts located beneath the rudder pedals.

(e) Verify airflow is present from the left side dropped aisle ducting in the cabin area.

3. Verify both PACs are operative as follows:

(a) Start left engine per checklist procedures, and set at idle power. Set APU BLEED AIR switch to OFF and verify ISO VALVE is set to closed.

(b) Place the CKPT PAC in the ON position. Place the CABIN PAC in the ON Position.

(c). Place the L ENG BLD AIR switch to the HP/LP position. Place the R ENG BLD AIR switch to the HP/LP position.

(d) Verify airflow is present at the pilot's and co-pilot's footwarmer duct located beneath the rudder pedals and airflow is present from the left side dropped aisle ducting in the cabin area.

(Continued Next Page)

SYSTEM & SEQUENCE NUMBERS

REMARKS OR EXCEPTIONS

21 AIR CONDITIONING
4. Pac Isolation Valve (continued)

6. Outflow Valves

4. Shut down engines.

5. Start APU per the checklist procedures and verify
normal operation.

(a) Place the isolation valve switch on the

environmental control panel to the CLSD position.

(b) Set APU BLEED AIR to ON. Place the CAB PAC

in the ON position. PLACE THE CKPT PAC in the ON position.

(c). Place the R ENG BLD AIR switch to the HP/LP position.

(d) Verify the isolation valve is closed by ensuring no airflow is present at the pilot and co-pilot's footwarmer ducts located beneath the rudder pedals.

(e) Verify airflow is present from the left side dropped aisle ducting in the cabin area.

6. Place placard adjacent to the ISOL VALVE selector stating, "ISOL VALVE INOP."

7. Make appropriate discrepancy report entry.

(M)(O) Both may be inoperative provided.

a) At least one valve is secured OPEN,

b) Aircraft is operated in an unpressurized configuration,

c) Aircraft is operated at or below 10,000 feet MSL, and

d) Baggage compartment remains empty.

MAINTENANCE PROCEDURES

(To Secure Outflow Valve(s)

NOTE: The secondary outflow valve is the most accessible of the two outflow valves and is located on the right side of the aft cabin area at FS 424.54, WL 106.15.

1. Gain access to the secondary outflow valve by removing necessary equipment and furnishings on right side of the vanity area.

2. Remove tee-bolt latch and O-ring at base of outflow valve.

3. Pull outflow valve from pressure bulkhead enough to secure the valve away from the bulkhead opening.

4. Place placard adjacent to the pressurization control panel stating, "PRESSURIZATION SYSTEM INOP."

5. Make appropriate discrepancy report entry.

OPERATIONAL PROCEDURES

1. Prior to engine start, crew will select “MANUAL” pressurization control.

2. Following takeoff, crew will monitor cabin differential gauge to ensure differential remains at “0”.

3. Do not operate the aircraft above 10,000 feet MSL.

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