AC/Press

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Author:
flytexas
ID:
1946
Filename:
AC/Press
Updated:
2009-11-30 21:55:29
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AC/Press
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AC/Press
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  1. EDC PRESS LOW light on.
    EDC oil pressure is low. Low level in sump. EDC driveshaft sheared.

    • a. With loss of spread, disconnect and dump EDC. Continue operation.
    • b. If spread is indicated, disconnect, monitor for loss of spread, dump. Continue operation. CAUTION
    • The DISCONNECT position should be selected only when the engine is operating in the normal rpm range to prevent EDC damage.
    • c. If spread is indicated after disconnect, execute the Emergency Shutdown procedure, paragraph 15.5.1. If the engine is allowed to operate due to a greater emergency, the EDC should be dumped.
    • NOTE If on ground and mission is continued:Ensure Normal rpm selected and ground air conditioning on prior to disconnect.
    • d. Refer to Air‐Conditioning System Malfunction (In Flight), paragraph 15.16.
  2. REFR OVHT (overheat) light on.
    Temperature in cooling duct exceeds safe limits. On ground: inoperative heat exchanger blower fan.


    • In flight, dump EDC. After light is out, operation is permitted in the manual mode at the two‐dot position or warmer.
    • On deck, turn off GRD AIR COND switch; investigate by checking the HEAT EXCHANGER cbs on BUS B and BLOWER CONT cb on MEDC. If cbs are set and the light is out, operation is permitted in the manual mode two‐dot position or warmer.
  • FAN OUT light on.
    Cabin exhaust fan is inoperative or lack of airflow.

    Open equipment doors for additional cooling. Use minimum electronic equipment. If EDCs are inoperative (no air‐conditioning available), open AUX vent.
  • EDC TEMP HIGH light on.
    EDC oil temperature excessive. Low oil level in sump. High engine oil temperature.

    • a. Check engine oil temperature; if high, correct.
    • b. If unable to control, disconnect, monitor for loss of spread, dump, continue operation.
    • CAUTION
    • The DISCONNECT position should be selected only when the engine is operating in the
    • normal rpm range to prevent EDC damage.
    • c. If spread is indicated after disconnect, execute the Emergency Shutdown procedure, paragraph 15.5.1. If the engine is allowed to operate due to a greater emergency, the EDC should be dumped.
    • d. Refer to Air‐Conditioning System Malfunction (In Flight), paragraph 15.16.
  • FUS DUCT HOT light on.
    • Leak in area around cross ship manifold, creating excessive temperature. Can be caused by a leak in the bleed air manifold, APU bleed air lines, or EDC plumbing.
    • *1. On ground, secure ground air‐conditioning and all engine and APU bleed air, and return
    • to the line.
    • *2. In flight, close all engine bleed and fuselage shutoff valves.
    • 3. If light remains on, dump EDCs one at a time.
    • 4. If light remains on, land as soon as possible.
  • CABIN PRESS light on.
    • Light on at cabin altitude 10,000 (+/-500) feet. CABIN PRESS light out by 8,000 feet on descent.
    • Refer to Pressurization Loss, paragraph 12.4
  • Master PRESS SYSTEM light on.
    • Oil pressure low or oil temperature high on left or right EDC. Cabin exhaust fan inoperative.
    • Refrigeration duct overheat warning.
    • Locate fault on overhead panel. Secure faulty system. Reset for continued warning protection.
  • Master RACK OVHT light on.
    • Electronic rack overheat condition exists. Also comes on during main DC bus failure. The ASH‐33 (DMTS) will cause a rack overheat indication when the system is initially turned on, or will illuminate continuously when a loss of airflow is detected.
    • Initiate Fire of Unknown Origin checklist/procedures. Locate overheated electronic bay(s) by
    • illuminated individual bay overheat light(s). Provide required cooling or secure equipment as necessary.
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