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Airplane Dispatch with Single Pack Operation - Confidence Check  500 
21-00-05  Figure 201  May 01/01 
Page 202 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Airplane Dispatch with Single Pack Operation - Confidence Check - Data Sheet 
May 01/01  Figure 202  21-00-05 
Page 203 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(6)  Pressurize the airplane as follows:
(a)  
Pressurize the airplane to 4.0 psid (Ref 5-51-91 MP) as follows: 1) Set the ISOLATION VALVE switch to CLOSE. 2) Supply pneumatic pressure to the right pack with the right engine at ground idle. 3) Supply pneumatic pressure to the left pack with the APU.

(b)  
Manually operate the aft outflow valve to maintain the cabin pressure of 4.0 psid as follows: 1) Make sure the pressurization mode selector is set at MAN AC or MAN DC. 2) Position the CLOSED/OPEN toggle switch as necessary to maintain 4.0 psid on

the DIFF PRESS gauge.
(7)  Do these steps after the airplane has been pressurized to 4.0 psid:
WARNING:  OBEY THE SAFETY INSTRUCTIONS WHEN YOU WORK IN THE AREA OF AN ENGINE IN OPERATION. INSPECT THE AIRPLANE FUSELAGE AND DOORS ON THE SIDE OF THE AIRPLANE THAT DOES NOT HAVE AN ENGINE IN OPERATION. FAILURE TO COMPLY WITH ALL SAFETY INSTRUCTIONS COULD RESULT IN PERSONNEL INJURY OR DEATH.
(a)  
Obey all safety instructions if you work around an engine that is in operation (Ref 71-09-100 MP).

(b)  
Inspect these components for any sign of leakage: 1) Doors 2) Hatches 3) Forward outflow valve 4) Equipment cooling valve 5) Bilge drains 6) Flight deck windows 7) Safety relief valve 8) Air conditioning and APU duct seals at the pressure bulkhead penetrations in

the air conditioning bays.
9) Outflow valve seal.

(c)
Make a record of evidence of leakage on the Part 1 data fields of Figure 201.

B.  Test of Pack Ability of Pressurize the Passenger Cabin
(1)  
Do this check of the right pack capability to pressurize the passenger cabin with right engine at ground idle:

(a)  
Set the L PACK switch on the air conditioning panel to OFF.

(b)  
Set the APU BLEED switch on the air conditioning panel to OFF.

(c)  
Make sure the R PACK switch is set to ON.

(d)  
Adjust the aft outflow valve to stabilize the cabin pressure to 4.0 PSID.

(e)  
If a differential pressure of 4.0 psid cannot be maintained, either a pack supply or airplane leakage problem exists. Refer to the troubleshooting for additional information.

(f)  
Make a record of these parameters on the data sheet:
1) Cabin rate of change
2) Bleed source
3) Duct pressure
4) N2%

(g)  
Inspect the left side of the airplane for air leakage while the right engine is in operation.

 (2)  
Do this check of the right pack capability to pressurize the passenger cabin with right engine at 65% N2:

(a)  
Advance the right engine throttle to 65% N2.

(b)  
Make a record of these parameters on the data sheet:
1) Cabin rate of change
2) Bleed source
3) Duct pressure
4) N2%

(c)  
Adjust the aft outflow valve to stabilize the cabin pressure to 4.0 PSID.

(d)  
If a differential pressure of 4.0 psid cannot be maintained, either a pack supply or airplane leakage problem exists. Refer to troubleshooting for additional information.

(3)  
Start the left engine with the APU bleed air.

(a)  Allow left engine parameters to stabilize.

(4)  
Set BLEED 1 to ON.

(5)  
Set the L PACK switch to ON.

(6)  
Put the R PACK switch to OFF.

(7)  
Put the BLEED 2 switch to OFF.

(8)  
Shut down the right engine.

(9)  
Do this check of the left pack capability to pressurize the passenger cabin with left engine at ground idle:

(a)  
Adjust the aft outflow valve to stabilize the cabin pressure to 4.0 PSID.

(b)  
If 4.0 psid cannot be maintained, refer to the trouble shooting to determine if there is a pack (air inflow) problem and/or and air leakage problem.
　
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