 TAWS significantly enhances flight safety of airplanes and helicopters, provides pilots with complete information about current situation and makes it possible to escape a ground-based obstacle without interference with AP passengers’ comfort. Providing an early terrain awareness warning, TAWS solves tasks of PWS, EGPWS, TAWS/HTAWS systems thus making it possible to replace existing SSOS, SPPZ-1 and SPPZ-89 (terrain awareness warning systems). Uninterruptedly assessing the altitude, speed, pitch and bank as well as position of an AP relative to the ground surface and artificial obstacles, glide slope, RWY, the TAWS provides safety of airplanes and helicopters in accordance with ICAO standards both in the air and at an airport. When installed on an AP the TAWS is automatically tuned in line with on-board equipment configuration (an airplane or a helicopter ) and does not require additional interface units. Visual information coming to the on-board annunciators and multifunctional displays is highlighted in red, yellow or green color depending on a hazard level thus informing the crew about current situation and providing escape from dangerous flight modes. The system is equipped with a new-generation GLONASS/GPS signal measuring receiver. The TWAS built-in test systems checks serviceability of the system aboard an AP and in the AMB without test and check equipment. Using the flight recorder data , TAWS employed by an air company provides on-line assessment of airplane equipment and crew's activities right after a flight. More than 400 AP are equipped with TAWS over the last 10 years! It operates successfully on the following airplanes: TU-204, TU-214, TU-334, IL-62M, IL-76MD, IL-76TD, IL-86, IL-114, YaK-40, YaK-42, S-80, Be-200, An-140. SSP -2010 (VHF Data Broadcast Receiver)- on-board satellite navigation and landing equipment - A series-produced certified HNF data broadcast receiver - VHF Data Broadcast Receiver. TAWS operating modes Airplane: Mode 1. – Excessive Rate of Descent. Class A, B, C. Mode 2. -Excessive Closure Rate to Terrain. Class A. Mode 3. - Negative Climb Rate or Accumulated Altitude Loss After Take-off or Missed Approach. Class A, B, C. Mode 4 - Flight into Terrain When not in Landing Configuration. Class A. Mode 5. Excessive Downward Deviation from an ILS Glide Slope. Class A. Mode 6. Excessive Deviation between Barometric and True Altitude during Approach Phase. Class A. Mode 7 - Forward-Looking Terrain-Avoidance (FLTA) function, which includes: • Reduced required terrain clearance. • Imminent terrain or obstacle impact. Class A, B, C. Mode 8. – A Premature Descent Alert. Class A, B, C. Mode 9. - Altitude Fly-by Alert during Approach Phase. Class A, B, C Mode 10. – unavailable. Mode 11. – unavailable. Mode 12. – unavailable. RAAS mode. Class A, B. C. During approach phase: Approach to RWY No. , approach to short RWY. While running on RWY: Approach to RWY No., remaining distance, RWY end. During takeoff: Takeoff from taxing way, on RWY No., remaining distance, negative RWY length, RWY end. Helicopter: Mode 1. - Excessive Rate of Descent. Class A, B, C. Mode 2. – Executive Closure Rate to Terrain. Class A. Mode 3. – Excessive Altitude Loss after Take-off. Class A. B. C. Mode 4 - Insufficient Terrain Clearance when not at landing speeds should be provided by 100 feet AGL. Class A. Mode 5 - Excessive Downward Deviation from an ILS glide slope. Class A. Mode 6 - Excessive Deviation between Barometric and True Altitude during Approach Phase. Class A. Mode 7 - Forward-Looking Terrain-Avoidance (FLTA) function, which includes: • Reduced required terrain clearance. • Imminent terrain or obstacle impact. Class A, B, C. Mode 8 – unavailable. Mode 9 - Altitude Fly-by Alert during Approach Phase. Class A, B, C. Mode 10 - Excessive Bank Angle. Class A. Mode 11 – Tail Strike. Class A. Mode 12 -Vortex loop. Class А,В,С. RAAS mode. Class A, B. C. During approach phase: Approach to RWY No., entry to RWY No. While running on RWY: Approach to RWY No. In order to enhance efficiency of the TAWS use on helicopters the system is equipped with a stand-alone control console that makes it easier to carry out operations with external stores during cargo airlifts, fire-fighting operations, rescue of people in emergency situations.
TAWS has an airworthiness certificate AR IAC No. SKGI -034-112-TWAS and Supplement N1 to airworthiness certificate No.SKI-034-112-TWAS/S1. Technical characteristics. Interface Analog input channels: linear /sin-cos 6/3 Digital channels: input/output via АRINC-429 20 / 8 Output ARINC-453 (708) 2 Bidirectional RS-232С (RS-488)/Ethemet/USB 1/1/1 Discrete channels (DC): input / output 32 / 24 Sound output channels: 600 Ohm, 0,1 W / 8 Ohm; 2 W 1 / 1 Temperature: Operating / limit -40°C... +60°С / -55°C... +85°C Warranty lifetime 10 000 flight hours Useful life 30 000 hours GLONASS/GPS built-in measuring receiver Number of independent channels 50 (GLONASS, GPS, INMARSAT, WAAS/EGNOS) Data output frequency 100 Hz Differential mode SAPS ICAO Power supply + 27 V / 115 V (400 Hz), 35 W (VA) Dimensions 57 x 190 x 220 mm, 1 К (ARINC 600)
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