[B737] CFM56-7B FADEC System

Introduction

The Fault Isolation Manual and the Fault Reporting Manual together
provide a structured method for the airplane operator to report
and correct faults in airplane systems.

1.  The Fault Reporting Manual (FRM) is primarily for the flight crew and
      the cabin crews.  The FRM contains these two alphabetical lists of
      faults:
a.  Observed Faults
b.  Cabin Faults

2.  For each fault in the FRM, there is a unique 8 digit fault code.

3.  The Fault Isolation Manual (FIM) is for the maintenance crews.  It
     contains alphabetical lists and numerical indexes of all the faults
     given in the FRM.  The FIM also has a fault isolation procedure for
     each of the faults.

4.  The BITE Manual is a condensed palm sized FIM Manual.
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Summary of Troubleshooting Procedure:
1.  Initial evaluation per FIM Task 75-21 Task 801 revealed that HPTACC valve fault is no longer active
2.  TCC dual channel fault still active
3.  Opened circuit breakers per FIM Task
4.  Opened thrust reversers per AMM Task 78-31-00-010-801-F00 p201
5.  Harness connector at TCC was found to be loose.
6.  Performed repair confirmation by assuring all electrical connectors are tight, closing circuit
     breakers and performed EEC Bite Test
7.  No faults found
Comments/Feedback:

The Rest of the Story:
Replaced HPTACC valve and tightened TCC sensor.  Ops check good