Maintenance Concept - Trouble Shooting Decision Tree
Figure 005
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B. How to Use the TSM (Ref. Fig. 006)
(1) Types of faults
In the TSM faults are divided according to the way they are displayed on the aircraft. There are two general divisions of monitored and non-monitored faults. Monitored faults are those which are monitored and displayed by the aircraft systems (mainly ECAM and CFDS). Non-monitored faults are not displayed by the aircraft systems and can be of a general nature, such as: "Nose landing gear doors slow to move". Within each of these general divisions faults are divided according to the type of system and display:
(a)
Monitored faults:
-ECAM warnings
-EFIS flags
-local warnings
-CFDS fault messages.
(b)
Non-monitored faults
-Crew and/or maintenance observations.
NOTE : All these types of fault are used as entry points into the
____ TSM under the titles given above and are summarized in the appropriate indexes.
(2) Entry into the TSM
(Ref. Fig. 006) Entry into a TSM trouble shooting procedure is initiated by a flight crew or maintenance crew report of a fault. The TSM can then be entered with the fault at the Fault Symptoms (P. Block 101), the Index of Warnings/Malfunctions, or the Index of CFDS Fault Messages -depending on the type of fault. From these pages the troubleshooter is directed to the procedure in P. Block 201 to isolate the fault. Three types of monitored faults (ECAM, EFIS and local) reported by the flight crew are usually associated with CFDS fault messages. The association principle of a Warning Malfunction and a CFDS fault message is described in paragraph 4.E.(1)(b). For these the first two digits of the ATA reference given on the PFR are used to enter directly into the appropriate TSM chapter fault symptoms (P. Block 101). CFDS fault messages are not normally reported by the flight crew and are used by maintenance crews. They can be displayed alone without an associated warning or malfunction, in which case they may be the entry point for maintenance related trouble shooting. TSM entry is via the appropriate TSM chapter fault symptoms (P. Block 101) using the ATA reference, or the Index of CFDS Fault Messages using the message text.
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Trouble Shooting Manual Entry
Figure 006
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Crew or maintenance observations are usually a single fault without an associated CFDS fault message. TSM entry is via the appropriate TSM chapter fault symptoms (P. Block 101) if the system (ATA reference) is known, or the Index of Warnings/Malfunctions using the fault text. Examples of trouble shooting these faults are given in the following trouble shooting examples.
C. Trouble Shooting Faults Reported on the PFR
(Ref. Fig. 007)
The following general procedure describes trouble shooting of Upper ECAM
DU warnings, ECAM STS (Status) Maintenance messages or CFDS fault
messages given on the PFR.
(1) Compare the ECAM warning or ECAM STS message with the CFDS fault message (if applicable) on the PFR to obtain the fault symptom and the ATA chapter reference. Alternatively, the user can find the ECAM warning or ECAM STS message alphanumerically in the I-ECAM section which will give the ATA chapter and section reference.
NOTE : A time difference of 1-3 minutes between the fault message and
____ the warning message may occur due to CFDIU internal behaviour.
(2) Go to the ATA chapter, locate the correct section of the FAULT SYMPTOMS (page block 101), find the correct sub-division and fault, correlate the CFDS fault message and note the associated task and page number.
NOTE : For further fault isolation use the source (SOURCE column)
____ and/or CFDS fault message identifiers (IDENT block). Due to the number of possible identifier, the fault message identifier in the TSM must be the same as on the PFR.
(3) Go to the FAULT ISOLATION PROCEDURES (P. Block 201) page number, confirm the task number (at the top left) and do the fault isolation procedure.
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