TRA 3500 Manual Rev H - 8 Ball Flying Club The TRA 3500 Radar Altimeter unit provides AGL altitude information

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  • FreeFlight Systems 3700 Interstate 35 Waco, TX 76706 (254) 662-0000

    Publication Number 1910-3500-01 Revision H

    TRI 40 Digital Indicator and

    TRA 3500 Radar Altimeter System

    Operation/Installation Manual

  • FreeFlight Systems 3700 Interstate 35 Waco, Texas 76706 (254) 662-0000 Printed in USA

    Publication Number 1910-3500-01 Revision H

    Title Page T-1

    TRI 40 Digital Indicator and

    TRA 3500 Radar Altimeter System

    Operation/Installation Manual

    February 28, 2002

  • Revision H February 28, 2002 TC-1

    TRI 40 DIGITAL INDICATOR TRA 3500 RADAR ALTIMETER UNIT

    INSTALLATION AND OPERATION MANUAL

    Table of Contents

    SECTION I .............................................................................................................................. 1-1 1. DESCRIPTION, SPECIFICATIONS AND ACCESSORIES..................... 1-1

    1.1. INTRODUCTION ............................................................................ 1-1 1.2. DESCRIPTION OF EQUIPMENT ................................................. 1-1 1.3. SPECIFICATIONS .......................................................................... 1-1 1.4. SYSTEM COMPONENTS AND ACCESSORIES ........................ 1-3

    1.4.1. ACCESSORIES REQUIRED, BUT NOT SUPPLIED ........ 1-3 1.4.2. ACCESSORIES OPTIONAL, BUT NOT SUPPLIED ........ 1-3

    SECTION II ............................................................................................................................. 2-1 2. OPERATION ................................................................................................ 2-1

    2.1. FUNCTIONAL OPERATION TRA 3500 ...................................... 2-1 2.2. FUNCTIONAL OPERATION TRI 40 DIGITAL

    INDICATOR .................................................................................... 2-2

    SECTION III ............................................................................................................................ 3-1 3. INSTALLATION ........................................................................................... 3-1

    3.1. GENERAL INFORMATION .......................................................... 3-1 3.2. UNPACKING AND INSPECTING EQUIPMENT ......................... 3-1 3.3. EQUIPMENT INSTALLATION TRA 3500 .................................... 3-1 3.4. EQUIPMENT INSTALLATION TRI 40 ......................................... 3-2

    SECTION IV ............................................................................................................................ 4-1 4. INSTALLATION DRAWINGS .................................................................... 4-1

    SECTION V ............................................................................................................................. 5-1 5. SYSTEM TESTING ...................................................................................... 5-1

    5.1. PRE-FLIGHT CHECK LIST - TRA 3500/TRI 40 ........................... 5-1 5.2. FINAL TESTING TRA 3500/TRI 40 ............................................... 5-1

    SECTION VI ............................................................................................................................ 6-1 6. WARRANTY ................................................................................................. 6-1

    6.1. LIMITED WARRANTY OF FREEFLIGHT PRODUCTS ........... 6-1

  • Revision H February 28, 2002 1-1

    SECTION I

    1. DESCRIPTION, SPECIFICATIONS AND ACCESSORIES

    1.1 INTRODUCTION

    This manual contains information relative to the installation and operation of the TRI 40 DIGITAL INDICATOR and TRA 3500 RADAR ALTIMETER UNIT manufactured by FreeFlight Waco, Texas.

    1.2 DESCRIPTION OF EQUIPMENT

    The TRA 3500 Radar Altimeter unit provides AGL altitude information from 0 feet up to 2500 feet maximum. The system consists of a TRA 3500 receiver/transmitter unit, two antennas and one TRI 40 indicator.

    1.3 SPECIFICATIONS

    The technical characteristics of the TRA 3500 receiver, transmitter, antennas, and TRI 40 are listed in Tables 1.3-1 and 1.3-2.

    1.3.1 TRA 3500 TECHNICAL CHARACTERISTICS

    Type: Dual antenna, FMCW Altitude Range: 0 to 2500 feet System Accuracy: 0 to 100 feet +5 feet

    100 to 500 feet +5% 500 to 2500 feet +7%

    Frequency Range: 100 MHz sweep within 4200 to 4400 GHZ range Input Voltage: Approximately 20 volts DC from indicator Input Current: 600 ma Altitude Output: Digital Self-test: Ground or flight, initiated at indicator Environment: -40 deg. C to +50 deg. C Physical: 2 ea. Antennas - 4.125" W x 4.375" L x .45" H 1 ea. R/T unit

    3" W x 6.875" L x 3" H Weight - 4.25 lbs. (includes 2 antennas, cables and R/T unit).

  • 1-2 Revision H

    February 28, 2002

    1.3.2 TRI 40 DIGITAL INDICATOR TECHNICAL CHARACTERISTICS

    Power supply: Input voltage + 27.5 VDC +20% Power - 20 Watts nominal (includes power to R/T unit)

    Environment: -20 deg. C to +55 deg. C Physical: Size - 7 1/2" L x 3 1/2" W x 1 3/8" H, weight - 3/4 pound Mounting: Front panel mounting, requires one-half of a 3" ATI

    mounting space

    Functional Characteristics

    Altitude range: 0 ft. to 2500 ft. Digital display resolution: 1 ft. from 0 ft. to 30 ft.

    5 ft. from 30 ft. to 100 ft. 10 ft. from 100 ft. to 400 ft. 20 ft. from 400 ft. to 1000 ft. 50 ft. from 1000 ft. to 2500 ft.

    Display hysteresis: Less than half the above resolutions. Unlock display: “U” when unlocked or displaying test altitude. Decision height: Set in 50 ft. increments from 0 ft. (OFF) to 600 ft., plus 700

    ft., 800 ft. and 900 ft. Display update rate: 2 times/second minimum. Gear warning: Aural and visual alert at 100 ft. when gear is up and aircraft

    is descending. May be disabled for fixed gear aircraft. Analog outputs: A. 2.5 mv/ft., 0 volts = 0 ft., 3000 ohm max load, 0 ft.

    to 2500 ft. range B. 20 mv/ft., 0.4 volts = 0 ft., 3000 ohm max load, 0 to

    500 ft. range Preset trip points: Eight open collector outputs provide preset decision height

    trip points every 100 ft. from 100 ft. to 800 ft. Display disable: Two inputs, ground or 28 volt DC disable signal, for use

    with strut switch or airspeed switch, optional use. Aural alerts: Decision height alert - 1 KHz tone for 1 second Gear

    warning - 1 KHz tone modulated at 100 Kz, for 1 second Self-test: Display all 8’s for 2 seconds, DH lights for first second with

    DH aural alert, and adds GEAR WARN with aural for next second. During next period test altitude is displayed with farthest left digit showing “U”. DH and GEAR light function normally during this period as do all outputs except preset DH trips remain open.

    Displays: Type - LED, amber seven segment Dimming - automatic control Data entry/controls:DECISION HEIGHT knobs, enters desired DH as read on right side of display. SELF-TEST button energizes TEST mode when pushed.

  • Revision H February 28, 2002 1-3

    1.4 SYSTEM COMPONENTS AND ACCESSORIES

    The TRI 40 installation kit (1901-3041-00) includes:

    ITEM FREEFLIGHT P/N QUANTITY

    Connector, 25 pin female 9-2190-188-10 1 Hood W/L lever 9-2190-188-20 1 Screw; 4-40 x 3/8 blk. oxi. 9-2804-068-10 4

    The TRA 3500 installation kit (1901-3501-00) includes:

    ITEM FREEFLIGHT P/N QUANTITY

    Coax Cable Assy 1900-0432-12 1 Antenna 9-1203-115-00 1

    The TRA 3500 hardware kit (1901-3501-05) includes:

    ITEM FREEFLIGHT P/N QUANTITY

    Button head cap screw 9-2806-115-00 8 Connector BNC UG88/U 9-2122-102-00 1 Mounting Tray 1900-3121-02 1

    1.4.1 ACCESSORIES REQUIRED, BUT NOT SUPPLIED

    ITEM FREEFLIGHT P/N QUANTITY

    RG 58A/U coax, 50 ohms 9-6026-103-00 A/R Circuit Breaker 3 Amp

    1.4.2 ACCESSORIES OPTIONAL, BUT NOT SUPPLIED

    ITEM FREEFLIGHT P/N QUANTITY

    DH Light Assembly 0136-0020-00 1

  • Revision H February 28, 2002 2-1

    SECTION II

    2. OPERATION

    2.1 FUNCTIONAL OPERATION TRA 3500 RECEIVER/TRANSMITTER/ ANTENNA

    The TRA 3500 Radar Altimeter system utilizes a solid-state voltage controlled oscillator (VCO) for its transmitter. This low power, low voltage device is the ultimate in reliability and simplicity. This technology allows FreeFlight Systems to continue to offer small, lightweight, reliable equipment.

    The TRA 3500 receiver/transmitter and antennas weigh only 4.5 pounds.

    The TRA 3500 system monitors above ground altitude from 0 feet to 2500 feet. The pilot may select a decision height altitude with the DH set and be alerted automatically when the aircraft drops below that altitude.

    When flying with the TRA 3500 system, the unit may occasionally unlock for intermittent periods of time at altitudes between 1500 and 2500 feet as a result of unfavorable reflectivity of terrain below the aircraft. Highly unfavorable terrain may be generally described as dry, loose soil, e.g., tilled dry ground or sand.

    The TRA 3500 system may also be observed to unlock when the aircraft is banked or in an attitude of pitch. The antenna beam width of the TRA 3500 system provides for bank angles of 30 degrees when below 1500 feet; this angle decreases to 20 degrees above 1500 feet. In cases of rapid descent or climb, the pitch of the aircraft may reduce the sensitivity of the TRA 3500 system, particularly between 1500 feet and 2500 feet.

    In cases of extremely rapid descent, both the response time of the system and pitch of the aircraft may prevent lock-on and normal operation. At a descent rate of 500 feet/minute, the TRA 3500 system will provide