MD-11 Flight Crew Operations Manual
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Air -
Controls and Displays
Air.30.6
MANUAL - Illuminates amber if the system is in manual. MANUAL flashes
if the system is in auto and a switch on the control panel has been pushed that
has no effect in auto.
When the SEL CAB PRES MAN alert is displayed on the EAD, the system
has reverted to manual. The system may be locked in manual by pushing this
switch.
4. CABIN PRESS MANUAL LDG ALT Knob
This knob is used to enter the landing field altitude if the information is not
available from the flight management system (FMS). Landing field altitude
is shown on the air system synoptic display. The knob has no effect when the
system is in manual.
The data is activated when the knob is rotated at least 120 degrees.
5. DITCHING Switch - amber
ON - Illuminates amber when pushed, and initiates the following functions:
•Inhibits EGPWS.
• Puts TCAS in TA only mode.
• Maintains existing cabin altitude.
• Shuts off packs at 2,500 feet radio altitude or when cabin differential
pressure is less than 0.5 psi.
• Closes venturi shutoff valve.
• Closes ram air door (if open).
• Closes outflow valve.
6. CLOSED Light - amber
Illuminates amber when the outflow valve is fully closed.
October 02, 2006
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