.
flight recorder

.
transponder altitude reporting

.
stall warning computers

.
TAT

.
yaw damper

.
Mach trim

.
symbol generator

Air Data Computers
Two air data computers (ADCs) are installed. Each ADC receives pitot and static pressure inputs from the respective pilot’s P/S system. The ADCs convert these pressure inputs to electrical signals which are used to operate various flight instruments and airplane systems. The ADC computers are powered whenever the AC busses are powered.
Copyright . The Boeing Company. See title page for details.
10.20.2  December 1, 2000
Flight Instruments, Displays -
 
System Description
737 Operations Manual
Pitot–Static System Schematic
2
STANDBY
ELECTRIC INERTIAL PNEUMATIC ELECTRIC INERTIAL
PNEUMATIC
ELECTRIC ELECTRIC
MACH VERTICAL AIRSPEED/ METRIC MACH VERTICAL
ALTIMETER ALTIMETER
AIRSPEED SPEED ALTIMETERALTIMETER AIRSPEED SPEED
AIR DATA
AIR DATA COMPUTER NO. 1
COMPUTER NO. 2
CAPT PITOT
F/O PITOT
CAPT STATIC F/O STATIC NO. 1 AUX STATIC NO. 2 AUX STATIC
NO. 2 AUX PITOT NO. 1 AUX PITOT
FLAP LOAD LIMIT
FLAP LOAD LIMIT AIRSPEED SWITCH
AIRSPEED SWITCH
1 1
PRESSURIZATION CONTROL
PITOT
CABIN ALTIMETER CAPT & F/O STATIC
AND DIFFERENTIAL PRESSURE NO. 1 & NO. 2 AUX STATIC
ALTERNATE STATIC
ALTERNATE STATIC
# As installed
Copyright . The Boeing Company. See title page for details.
December 1, 2000  10.20.3
Flight Instruments, Displays -System Description 737 Operations Manual

Total Air Temperature
One TAT probe is installed. On some airplanes, the TAT probe is aspirated. It provides independent temperature data to each ADC. Total air temperature data derived from ADC No.1 is used by the left IRS, the FMC, autothrottle, FCC “A” and the air temperature indicator. Total air temperature derived data from ADC No. 2 is used by the right IRS, the FMC, autothrottle and FCC “B.”

TAT PROBE ASPIRATED TAT PROBE LEFT FORWARD FUSELAGE
Copyright . The Boeing Company. See title page for details.
10.20.4  December 1, 2000

Flight Instruments, Displays -System Description 737 Operations Manual
The inflight TAT indication is comprised of outside air temperature (OAT) plus all of the ram rise. On the ground, the TAT indication is approximately OAT if pitot heat is OFF. With an aspirated TAT probe installed, the TAT indication on the ground is approximately OAT when an air conditioning pack is switched to AUTO or HIGH. In flight, the following table is used to convert indicated TAT to true OAT.
INDICATED MACH NUMBER 
.30  .40  .50  .60  .70  .73  .76  .78  .80  .82  .84
IND TAT - °C  TRUE OUTSIDE AIR TEMPERATURE - DEGREES C
 70  47  39  37  35  33  31  29  27
 65  49  42  35  33  30  28  26  25  23 
60  49  44  37  30  28  25  24  22  21  19
 55  49  45  40  33  26  24  21  19  18  16  14
 50  45  40  35  28  21  19  17  15  13  11  10
 45  40  35  30  23  17  15  12  11  9 7  5
 40  35  30  25  19  12  10  8 6  4 3  1
 35  30  26  20  14 8  6  3  1  0  - 2  - 3 
30  25  21  16  10 3  1  - 1  - 3  - 5  - 6  - 7 
25  20  16  11  5 - 2  - 3  - 6  - 7  - 9  -11  -12 
20  15  11 6  0  - 6  - 8  -10  -12  -13  -15  -16 
15  10  6 2  - 5  -11  -13  -15  -16  -18  -19  -21 
10  5  1  - 3  - 9  -15  -17  -19  -21  -22  -24  -25 
5  0  - 3  - 8  -14  -20  -21  -24  -25  -27  -28  -29 
0  - 5  - 8  -13  -18  -24  -26  -28  -30  -31  -33  -34 
- 5  -10  -13  -18  -23  -29  -31  -33  -34  -35  -37  -38 
-10  -15  -18  -22  -28  -33  -35  -37  -39  -40  -41  -43 
　
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