Sandel ST3400 - TAWS Compliance and Requirements

GPWS Mode 2
Excessive Closure Rate to Terrain
GPWS Mode 3
Altitude Loss After Takeoff
GPWS Mode 4
Flight Into Terrain Not in Landing Configuration
GPWS Mode 5
Excessive Downward Deviation from Glideslope
GPWS Mode 6 Voice callout “Five Hundred” when the aircraft descends through
500 feet Radar Altitude
Class A TAWS requires a display, which shows the aircraft in relation to the terrain. Satisfied
by the ST3400 dedicated display.
Class A TAWS requires a radar altimeter (for GPWS functions).
CLASS B TAWS FUNCTIONAL REQUIREMENTS
Mode
Function
FLTA
Forward Looking Terrain Alert
PDA
Premature Descent Alert
GPWS Mode 1
Excessive Rate of Descent
GPWS Mode 3
Altitude Loss After Takeoff
GPWS Mode 6 Voice callout “Five Hundred” when the aircraft descends to 500
feet above the nearest runway elevation
When configured as a Class B TAWS system, the ST3400 exceeds the FAA Class B TAWS requirements.
Even in Class B mode without radar altimeter, the ST3400 includes Class A features such as a terrain
display and an excessive glide slope deviation alert, when so configured.
1.2.3 TAWS Class A/Class B Required Equipment
The ST3400 uses the following equipment to meet Class A or Class B
requirements.
ST3400 CLASS A TAWS EQUIPMENT REQUIREMENTS
Equipment
Class A
Class B
Terrain Display
Integrated
Integrated
Radar Altimeter
Required
Optional
GPS or FMS System
Required
Required
Heading System
Required
Required
Audio Panel
Required
Required
Air Data Computer
Required
Dependent on GPS
Remote
Switch/Annunciators
Optional in single pilot aircraft;
required in two-crew aircraft
Optional
Flap Position
Required
Recommended
Gear Position
Required if retract gear
Recommended
ILS Receiver
Required
Recommended
NAV
Optional (for RMI)
Optional (for RMI)
ST3400 INSTALLATION MANUAL 82002-IM-L
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