PITOT-STATIC/AIR DATA STANDBY INSTRUMENTS -MEC COMPONENT LOCATIONS -2
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PITOT-STATIC/AIR DATA STANDBY INSTRUMENTS -FWD CARGO COMPARTMENT COMPONENT LOCATIONS Static SADM and Static ADMs
The static SADM and the three static ADMs are in the forward cargo compartment ceiling, above the cargo liner.
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PITOT-STATIC/AIR DATA STANDBY INSTRUMENTS -FWD CARGO COMPARTMENT COMPONENT LOCATIONS
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PITOT-STATIC/AIR DATA STANDBY INSTRUMENTS -EXTERNAL COMPONENT LOCATION
Pitot Probes Location
There are 3 pitot probes on the airplane. The left pitot probe is on the left side of the airplane. The right and center pitot probes are on the right side of the airplane.
Static Ports Location
There are six static ports on the airplane. There is a left, center, and right static port on each side of the airplane.
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PITOT-STATIC/AIR DATA STANDBY INSTRUMENTS -EXTERNAL COMPONENT LOCATION
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PITOT-STATIC/AIR DATA STANDBY INSTRUMENTS -POWER
Power
28v dc power comes from the STBY IND circuit breaker on the left power supply assembly through the STBY INSTR -ALT and STBY INSTR -AIRSPEED circuit breakers on the P11 panel. Power goes to the air data standby instruments, then to the standby air data modules (SADMs).
See the air data inertial reference system section for more information on ADM power (SECTION 34-20).
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PITOT-STATIC/AIR DATA STANDBY INSTRUMENTS -POWER
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PITOT-STATIC/AIR DATA STANDBY INSTRUMENTS -INTERFACE
629 Interfaces
The pitot probes and static ports send air pressure through pressure lines to the ADMs. The ADMs change the air pressures into ARINC 629 data. The data goes on the flight controls ARINC 629 buses to the ADIRU and SAARU.
The ADMs have interface only with the onside flight control ARINC 629 bus.
429 Interfaces
The center pitot probe sends pitot pressure to the pitot SADM. The pitot SADM sends the pitot pressure to the standby airspeed indicator on an ARINC 429 bus.
The center static ports send static pressure to the static SADM. The static SADM sends the static pressure to the standby altimeter and the standby airspeed indicator on an ARINC 429 bus.
Pressure lines
The pressure lines go from the pitot tubes and static ports to the ADMs. The static lines average 24 feet long and the pitot lines average 74 inches.
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PITOT-STATIC/AIR DATA STANDBY INSTRUMENTS -INTERFACE
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PITOT-STATIC/AIR DATA INSTRUMENTS -PITOT PROBES AND STATIC PORTS
Static Ports
The static ports supply static pressure to the static air data modules (ADMs).
Pitot Probes
The pitot probes supply total pressure to the pitot ADMs.
Before you remove a pitot probe, obey this warning.
WARNING: MAKE SURE THAT THE PITOT PROBE HEAT IS OFF. INJURY TO PERSONS CAN OCCUR.
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PITOT-STATIC/AIR DATA INSTRUMENTS -PITOT PROBES AND STATIC PORTS
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PITOT-STATIC/AIR DATA STANDBY INSTRUMENTS -STANDBY AIR DATA MODULE
General
There are two standby air data modules (SADMs) on the airplane.
The SADMs and the ADMs are different in size and shape. Since they send data on different ARINC formats, they are not interchangeable.
SADM Hardware
The SADM is rectangular, 6 in. deep x 3 in. wide x 2.5 in. tall
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