MD-11 Flight Crew Operations Manual
k
Instrumentation and Navigation -
Description and Operation
Inst.10.9
Pitot/Static System
The Captain's pitot tube is connected to CADC1 and the First Officer's pitot tube
is connected to CADC2. The auxiliary pitot tube is connected to the standby
altimeter/airspeed indicator.
Four static ports are installed on each side of the aircraft. A port from each side is
provided for the Captain's static pressure system and the First Officer's static
pressure system. The other ports are spares.
Each pilot port is cross connected to minimize errors caused by aircraft yaw. The
Captain's ports are connected through the Captain's STATIC AIR selector to
CADC1. The First Officer's ports are connected through the First Officer's
STATIC AIR selector to CADC2.
The alternate static system has two flush ports symmetrically located on each side
of the aircraft at some distance from the static plates. The ports are cross
connected to minimize errors and are connected to the standby altitude/airspeed
indicator and both STATIC AIR selectors.
The STATIC AIR selectors allow the pilots to switch the source of static pressure
for their respective CADCs from their normal ports to the alternate port.
Air Data Parameters
The following parameters are output by the CADCs:
• Standard altitude.
• Captain's baro-corrected altitude.
• First Officer's baro-corrected altitude.
• Computed airspeed.
• Mach number.
• Altitude rate.
• Maximum operating speed.
• True airspeed.
• Total air temperature.
• Static air temperature.
• Overspeed signal.
• Total pressure.
• Static pressure.
• Impact pressure.
• Indicated angle-of-attack.
The following aircraft systems use the CADC outputs:
• Flight control system.
• Flight Management System (FMS).
• Electronic Instrument System (EIS).
November 16, 2009
To Next Page
Loading...