Low Range Radio Altimeter
Form & fit replacements of discontinued ALT-50A/-55B (see P/N chart below for specific replacement information)
Intended for single installations certified for Category II landings and for dual or triple installations in Category IIIa (ALT-1000 is intended for single installations in Category II ONLY)
Measures radar height above terrain up to 2,500 feet
Accurate to within two feet at the critical low altitudes
Entirely digital, allowing for complete end-to-end monitoring
Frequency-Modulated Continuous Wave (FMCW) technology
Versions with analog outputs capable of driving existing indicators
Analog outputs in ALT-55B or ARINC 552A format - strap selectable
Four ARINC 429 digital buses
Used with ANT-52 antennas
Available with standard or shop-adjustable trips (see table below)
Full temperature/altitude capability
Stringent lightning and HIRF hardening
Single unit packaged in a 3/8 ATR short-low package
Package and aircraft mounting are identical to the ALT-55B
Lightweight at 4.7 pounds with additional aircraft installation delay selections that can reduce antenna cable weight
Front panel computer port for system configuration and access to system faults
Computer interface that allows for flight simulation to aid checks of associated systems
Versions compatible with Collins FPA-80 Flight Profile Advisory aural alert unit
Versions available that directly plug in and the replace ALT-55B/-50A
SPECIFICATIONS
FAA TSO: | C87 | SOFTWARE: | DO-178B Level A (critical) |
EUROCAE: | ED-14C | ENVIRONMENTAL: | DO-160C, /A2F2/BB/ CLMNY/E1XXXXXZ/ BZ/AZ/AZ/ Y/AZ/Z3Z3/XX |
DIMENSIONS: | 3.313" H x 3.562" W x 13.925" L | WEIGHT: | 4.7 lb |
COOLING: | No forced air required | TEMPERATURE: | -55°C to 70°C |
ALTITUDE: | 55,000 ft. | POWER REQ: | 28 ± 20% V DC, 16 W |
CENTER FREQ: | 4300 ±15 MHz | RF POWER OUTPUT: | 350 mW nominal |
MODULATION: | Selectable, 49, 50 or 51 Hz | LINEAR FM DEVIATION: | 100 MHz, nominal |
ALTITUDE OUTPUTS: | Four isolated buses | DIGITAL: | Binary Label 164; BCD Label 165 per ARINC 429, 707 |
ANALOG: | Two isolated outputs, strap selectable mode | ARINC 552A MODE: | -20 to +480 ft; 0.2 (h+20)Vdc +480 to +2,500ft; 10 + 10 In Vdc |
ALT-55 MODE: | -20 to +500ft; 0.02(h+20)Vdc | SYSTEM ACCURACY: | 500 to 2,500 ft ±3% |
OUTPUT LOADING: | 20 standard loads per bus(digital); 1mS max (analog) | TIME CONSTANT: | 0.09 ± 0.01s |
TRIPPED OUTPUTS: | < +1.5Vdc @ 100mA max | UNTRIPPED OUTPUTS: | < 20µA @ 30Vdc max |
FACTORY TRIP: | -125: 200, 500, 1000, 1500ft (adj); -026: 200, 250, 1000, 1200ft (fixed); -206/306: 200, 250, 1000, 1200ft (adj) | DELAY (AID) SELECTIONS: | 20, 26, 32, 40, 46, 52, 57, 63ft |
PART NUMBER: | DESCRIPTION: |
---|---|
822-0615-125 | Adjustable Trips, Analog out, Replaces ALT-55B -001/-011 |
822-0615-126 | Fixed Trips, Analog out, Replaces ALT-55B -002/-012 |
822-0615-175 | 5G Replacement for ALT-55B PN 622-2855-011 |
822-0615-205 | Fixed Trips, 429 out |
822-0615-206 | Adjustable Trips, 429 out |
822-0615-305 | Fixed Trips, 429 & Analog out |
822-0615-306 | Adjustable Trips, 429 & Analog out |