500  Airplane Ability to Maintain Cabin Pressure in Flight 
May 01/01  on Single Pack Operation -Trouble Shooting  21-00-05 
Figure 101 (Sheet 2)  Page 103 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

SYSTEM  MINIMUM REQUIREMENT  REQUIREMENT SATISFIED 
YES  NO 
ENGINE BLEED DUCT PRESSURE - GROUND IDLE  DUCT PRESSURE SHOULD BE 15 TO 20 PSI  CONTINUE TO MAINTAIN BLEED SYSTEM COMPONENTS ON 1C - CHECK INTERVALS AS SPECIFIED IN MPD 36-11-20 ITEMS.  CONSIDER ACCOMPLISHING THE ENGINE BLEED AIR DISTRIBUTION SYSTEM [TEST (REF 36-11-0 A/T)] TO HELP IMPROVE SYSTEM PERFORMANCE 
ENGINE BLEED DUCT PRESSURE - 65% N2  DUCT PRESSURE SHOULD BE 26 TO 38 PSI. 
CABIN PRESSURIZATION CONTROL SYSTEM  AFTER SUCCESSFUL COMPLETION OF CONFIDENCE CHECK, CABIN PRESSURE CAN BE MAINTAINED  CONFIDENCE IS HIGH THAT CABIN PRESSURE CAN BE MAINTAINED  CONSIDER ACCOMPLISHING CABIN PRESSURIZATION SYSTEM TEST (REF 21-31-00 A/T) 

Airplane Ability to Maintain Cabin Pressure in Flight  500 
21-00-05  on Single Pack Operation -Trouble Shooting  May 01/01 
Page 104  Figure 101 (Sheet 3) 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

CONFIDENCE CHECK OF AIRPLANE ABILITY TO MAINTAIN CABIN PRESSURE IN FLIGHT ON
SINGLE PACK OPERATION -MAINTENANCE/PRACTICES
1.  General
A.  The function of this procedure is to do a ground check of the capability of the air conditioning pack(s) to pressurize the airplane when it is in flight. This test can be accomplished prior to dispatch at an interval best determined by the operator
B.  This confidence check consists primarily of the three parts that follow:
(1)  
Airplane pressurization to 4.0 psid with the right engine and the APU.

(2)  
Comparison of the capability of the pack(s) to pressurize the airplane with engine bleed sources at ground idle and at 65% N2. The pack performance will be determined by the collection and comparison of the cabin pressure rate of change indications. The cabin rate of change indications during the test are to be recorded on the data sheet of Figure 202.

(3)  
Determination if the airplane is unable to maintain pressure due to a leaky cabin or a pack performance problem.

C. Figure 201 provides a graphical representation of the three parts of this confidence check.
2.  Airplane Dispatch with Single Pack Operation -Confidence Check
A.  Airplane Pressurization
(1)  
Prepare for airplane pressurization as follows:

(a)  
Make sure that the nose and main landing gear are pinned (Ref 32-00-01/MP).

(b)  
Inspect the condition of all door seals for evidence of wear and tear. 1) Record the condition of the door seals on the data sheet of Figure 202.

(c)  
Lower the bay doors for the air conditioning equipment.

(2)  
Make sure that there is audio communication between the flight compartment personnel and ground personnel.

(3)  
Supply electrical power (Ref 24-22-00 MP).

(4)  
Position the ISOLATION VALVE valve to OPEN.

(5)  
Do these steps to make sure the pack valves operate correctly:

(a)  
Start APU (Ref 49-11-0 MP)

(b)  
Put the APU BLEED switch on the air conditioning panel to ON.

(c)  
Make sure the right pack value is fully closed.

(d)  
Set the R PACK switch on the air conditioning panel to ON.

(e)  
Hold the PASS CABIN temperature selector knob on the air conditioning temperature control panel in the manual COOL position until the AIR MIX VALVE indicator moves to full COLD.

(f)  
Make sure the right pack valve moves to a position between full open and partially closed.

(g)  
Hold the temperature selector knob in the manual WARM position until the indicator moves to full HOT.

(h)  
Make sure the right pack valve moves toward the closed partition.

(i)  
Hold the temperature selector knob in the manual COOL position until the indicator moves to full COLD.

(j)  
Make sure the right pack valve returns to the same position observed in step (f).

(k)  
Set the R PACK switch to OFF.

(l)  
Make sure the right pack valve moves to full closed.

(m)
Repeat steps (c) thru (l) for left pack valve using the L PACK switch and the CONT CABIN temperature selector knob.

500 
May 01/01  B
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