Boeing 737 - PACK

737 Operations Manual
Non-Normal Checklists -
Air Systems
Copyright © The Boeing Company. See title page for details.
NNC.2.6 D6-27370-400E-TBCE
PACK
Condition: A PACK light illuminated indicates both primary and
standby pack controls have failed or the related pack
valve closed due to temperature exceeded limits.
ALL TEMPERATURE
SELECTORS . . . . . . . . . . . . . . . . . . WARMER TEMPERATURE
[Reduces the work load on the affected air conditioning pack.]
TRIP RESET SWITCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . PUSH
[ If the PACK light illuminated as a result of the pack temperature
exceeding limits, the light extinguishes if the pack temperature has cooled
below limits.]
If one PACK light remains illuminated:
ISOLATION VALVE SWITCH . . . . . . . . . . . . . . . . . . . CLOSE
PACK SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
If both PACK lights remain illuminated:
Note: Both pack valves may have closed resulting in a
gradual loss of cabin pressure and an eventual
CABIN ALTITUDE warning.
Monitor cabin altitude during the remainder of the flight.
If cabin altitude increases:
DESCENT . . . . . . . . . . . . . . . . . . . . . . . . . ACCOMPLISH
Monitor cabin altitude and rate. Descend to lowest
safe altitude or 10,000 feet, whichever is higher.
Continued on next page
June 07, 2002