2. Descend to 25,000 feet or below, if circumstances permit.
3. Canopy and windshield defrost lever — INCREASE momentarily. This will determine whether normal defrost airflow is available and will offer an indication of where a possible malfunction has occurred.
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. Cockpit temperature rheostat (F-100F Airplanes) — Move out of HI-FLO. This will prevent possible overspeed with resultant damage to the equipment cooling turbine.
c. Canopy and windshield defrost lever — As needed to help maintain desired cockpit pressurization.
d. 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 EMER OFF shuts off engine compressor air and renders inoperative, or shuts off, the following: 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. This will allow ram air to enter the cockpit.
6. Land as soon as practical.
JETTISON OF EXTERNAL LOAD
EXTERNAL LOAD JETTISON (RETAINING SPECIAL STORE)
All external loads, except the special weapon, can be jettisoned electrically by use of the external load emergency jettison button. If electrical power is not available or the external load emergency jettison handle is used, only low-blow stores and 275/335-gallon drop tanks can be jettisoned. External loads (non-nuclear weapons) are jettisoned in a safe condition.
1. External load emergency jettison button — Press.
2. External load emergency jettison handle — Pull. Pulling this handle jettisons only low-blow stores and 275/335-gallon drop tanks.
3. Station selector switches* — JETT.
4. Armament selector switch — JETTISON ALL (PYLON JETT*) — Press bomb button.
5. External load auxiliary release buttons — Press one at a time at intervals of one second or more.
CAUTION — Do not press more than one auxiliary release button at a time. The combined recoil of ejector cartridges for stores that require the full force of the ejector cartridges produces stresses that can damage the wing structure. This does not include stores loaded “low-blow”, since they do not require the full force of the ejector cartridge for release.