Atc System - Adjustment/Test; Operational Test - Atc System; General - Boeing 737-300 Series Maintenance Manual

Atc system

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Table Of Contents

Table of Contents

General

A. The ATC system adjustment/test procedure contains two tasks. One is an operational test; the other is a

system test. The operational test is a fast check of the ATC system and no test equipment is needed. The

system test first does the operational test. Then it uses test equipment to examine the ATC code reception,

altitude reporting, transponder sensitivity, side lobe suppression and transmitter frequency.

B. The system test uses the Instrument Flight Research 601 ATC ramp test sets or the TIC T-48 or T-49 ramp

test set. Because the ATC transponder responds to signals from the antenna with the strongest signal

strength, it is necessary to put the test set antenna close to the airplanes antenna to do a proper test. The test

set antenna should be put near the bottom ATC antenna on the airplane to examine the bottom transponder

circuitry and the same for the top ATC antenna.

Operational Test - ATC System

A. General

(1) The operational test is a fast check of the ATC system. It uses only the system's BITE function. No

special test or ground equipment is necessary.

(2) The ATC transponder internal BITE circuitry does a self-test on all internal circuitry. This includes the

injection of Mode S signals into the receiver unit to examine if the signals are processed properly. If

the Mode S function fails, the red TPR FAIL LED indicator comes on.

B. References

(1) AMM 24-22-00/201, Manual Control

C. Access

(1) Location Zones

101/102 Flight Compartment

205 Electronic Compartment

(2) Access Panel

1201 Electronics Equipment Access Door

D. Prepare for the Operation Test

(1) Supply electrical power (AMM 24-22-00/201).

(2) Close these circuit breakers.

(a) P18 Load Control Center - Left

1) ATC 1

2) ADC 1

3) ALTM CAPTAIN

(b) P6 Load Control Center - Right

1) ATC 2

E. Procedure (Mode-S Transponder)

(1) On the ATC Control Panel, set the transponder select switch 1.

(a) Start the self test on the front of the transponder.

(b) Airplane with Collins ATC transponder;

Make sure the LED's sequence that follows occurs:

1) All LED's comes on for about one second

2) All red LED's go off

3) The green LED stay on

(2) Set the ATC system to STBY.

EFFECTIVITY

PW245

Use and disclosure shall be in accordance with the proprietary legend located on the cover of this document

GENERAL AEROSPACE

Boeing 737-300

MAINTENANCE MANUAL