Narco AT-150 Transponder

Post Install Tests

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2.6 Post Installation Tests

To certify the installation, FAA Form 337 must be completed. In addition, weight and balance or any operating limitations must be entered into the aircraft logbook. Refer to the current Federal Aviation Regulations for any additional requirements.

Weight 2.3 lbs (I. 04 kg)
Power Requirements 1. 0 Amperes, Receive
1.6 Amperes, Transmit
0.26 Amperes, Pilot Lamps

2.6.1 Preflight Tests

A preflight test should be performed using an ATC-600A Transponder and DME test set or equivalent. The test set should be set-up as described in the ATC-600A Operators Manual and following tests should be conducted:

  1. Pilot Code
  2. Peak Transmitter power
  3. Transmitter Frequency
  4. SLS Operation
  5. IDENT
  6. Percent Reply

In the event that an altitude digitizer has been installed, the altitude digitizer manual should be consulted for proper procedures and the following tests should be conducted:

  1. Altitude Code
  2. Invalid Altitude Code Output

2.6.2 Flight Test

After installation, a flight test should be performed to check overall operation and system compatibility.

  1. Range Test
    The AT 150 should furnish a strong and stable return signal to an interrogating radar facility that is 50 NM away when the aircraft is flying at 6000 feet. At this altitude and distance, fly a flat circle while having an FAA station monitor the transponder return signal. There should be no more than two sweeps of the interrogating radar without a return response.
  2. Surveillance Approach
    Perform an approach to a runway of an airport starting at least 10 NM from the airport served by Airport Surveillance Radar (ASR) having an Air Traffic Control Radar Beacon System (ATCRBS) facility. Alternately, a simulated approach and letdown may be made along a path parallel to, but separated, three to four miles from a vertical plane through the location of the ASR facility. The approach should be made at the normal rate of descent and normal approach and landing configuration for the aircraft and should continue down to an altitude of 200 feet. Not more than one "drop out" should occur for any 10 radar sweeps during final approach.
  3. Electromagnetic Compatibility
    The transponder should <unintelligible> other systems aboard the aircraft to be degraded below their normal capability and transponder operation should not be adversely affected by other equipment.

2.7 Aircraft License Requirements

The AT 150 TSO, as installed in the aircraft, requires an Aircraft Radio Station License. This license may be obtained by filing FCC Form 404. The unit may be operated for up to 30 days after filing the FCC Form 404 providing a copy of the FCC Form 404 is kept in the aircraft.

This equipment has been type accepted by the FCC and entered in their list of type accepted equipments as "NARCO AT 150 TSO".