B757 Review Questions. Air Systems. What is the maximum altitude the APU can provide pneumatic pressure for pressurization? 17,000’. Air Systems. An illuminated BLEED light indicates the air temperature is high and the Bleed Air Valve has closed. Is this situation re-settable by the crew?
Smoke in supply duct - Overboard exhaust duct is latched opened left recirculation fan is turned off in flight. Both air conditioning packs go to high flow, right recirculation fan is turned off, overheat light is inhibited for 5 minutes.