Heat and Vent Emergency

Emergency Depressurization (Intentional)

  1. Oxygen—100%.
  2. Descend to 25,000 feet or below, if circumstances permit.
  3. Emergency ram-air lever—Between CLOSED and OPEN*.
  4. Cockpit pressure selector switch—RAM AIR ON

  5. Emergency Ram-Air lever—OPEN—if temperature is too cold or too hot.

    Note

    The cockpit is decompressed rapidly when the cockpit pressure selector switch is moved to RAM AIR ON or the emergency ram-air lever is moved from the CLOSED* position.

  6. Cockpit pressure selector switch—OFF

  7. Emergency Ram-Air Lever—CLOSED—If no airflow or pressurization is necessary.

    Warning

    During this no-ventilation condition, use 100 percent oxygen to offset the effects of possible cockpit contamination.

  8. Land as soon as practical.

    Caution

    After the cockpit has been depressurized, resume normal operation of the pressurization system by moving cockpit pressure selector switch of the RAM AIR ON position, which closes the ram-air lever.

Emergency Depressurization (Unintentional)

If sudden depressurization occurs because of a sudden stoppage of airflow to the cockpit, proceed as follows:

  1. Oxygen—100%.
  2. Altitude—25,000 feet*—Or lower, if circumstances permit.
  3. Canopy and windshield defrost lever—INCREASE MOMENTARILIY—Then determine if normal defrost airflow is available and indicates an identifiable malfunction.

  4. Normal defrost air available. If normal defrost air is available, the malfunction has probably occurred downstream of the main system shutoff valve. To minimize possible damage to equipment:

    a. Cockpit pressure selector switch—OFF (RAM AIR ON) or emergency ram-air lever—OPEN OR RAM PRESS—Either of these actions will close the main system shutoff valve. b. Canopy and windshield defrost lever—AS REQUIRED—Maintain desired cockpit pressurization. c. Defrosting, anti-icing, pressurization (except cockpit), and equipment cooling—Use as necessary.

  5. Normal defrost air not available. If normal defrost air is not available, the malfunction has probably taken place upstream of the main system shutoff valve. To minimize fire hazard due to possible leakage of hot air:

    a. Bleed-Air Emergency Switch—EMER OFF

    Warning

    Moving the bleed-air emergency switch to the EMER OFF position shuts off engine compressor air shuts off fuel transfer from the drop tanks, canopy seal, cockpit air conditioning and pressurization, ventilated suit, canopy and windshield defrost, anti-G suit, pitot boom anti-ice windshield ice and rain removal, and cooling of the aft electronic equipment.

    b. Emergency Ram-Air Lever—OPEN OR RAM PRESS.—Allows ram air to enter the cockpit.

  6. Land as soon as practical.