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STUDENT GUIDE FOR T-1A AIRCRAFT SYSTEMS
CHAPTER TEN
Indicated Airspeed Displays
The MSI provides two IAS displays, one is digital and one is an IAS pointer rotating around a
scale.
1.
IAS Digital Display - The green numeric display indicates current IAS in one-knot
increments. Green dashes appear when IAS drops below 30 knots. Green dashes are displayed
until the current IAS is greater than 35 knots or when IAS data is not received. An IAS
annunciation appears when IAS data is not valid. The IAS display is red and continuously
flashes and the overspeed warning horn is activated when Maximum Operating Speed
(VMO)/Maximum Mach Operating Speed (MMO) is exceeded.
2.
IAS Pointer and Scale Display - The green IAS pointer indicates current indicated
airspeed and rotates around a 60-420 knot white airspeed scale. A red striped VMO pointer
rotates around the IAS scale indicating maximum operating airspeed for existing flight
conditions. The display blanks and a red pointer icon appears in the IAS pointer when the ADC
VMO data is not valid.
Mach Speed Display
The green numeric display indicates current mach speed. The hundredths digit simulates a
rotating mechanical wheel. The mach speed display and legend is visible when mach speed is
0.45 or greater. The mach speed display is red and continuously flashes and the overspeed
warning horn is activated when VMO/MMO is exceeded.
1.   IAS/Mach Reference Display - The reference airspeed display will automatically
transition to the mach reference as the aircraft climbs through 29,500 feet. The IAS/mach
reference display is blanked when the IAS or mach reference is not valid.
2.   TAS Display - The green numeric display indicates current true airspeed. Green dashes
are displayed when TAS data is not received. Red dashes are displayed when the TAS data is
invalid.
3.   Temperature Display - The green display indicates RAT, SAT, or ISA, calculated from
input data sensed by the dual element temperature probe and calculated by the respective ADC
computers. The normal display is RAT.
1009. ATTITUDE HEADING REFERENCE SYSTEM
The AHRS provides attitude gyro, directional gyro (compass), and accelerometer functions. The
AHRS is a dual system (one for each P). Each system functions independently but can supply
data for both positions by using a reversion function. The AHRS consists of two AHCs, two
Flux Detector Units (FDU), EFIS displays, switches and indicators, and a standby battery. If
primary power to the AHRS drops below a preset limit, the AHC automatically switches to
standby power. The standby power supply provides approximately 11 minutes of AHC
operation. During a failure, flags on the EADI, EHSI, and MFD (if composite) are annunciated.
AVIONICS
10-9


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