[19] FUEL LEAK DTR - Used in Sections 8.1 and 11.1 to indicate the probability of detecting a crack by fuel leak for the SSI in Block 3. The value is based on reported service data, is provided on the forms, and assumes an adequate maintenance program for detecting fuel leaks. It takes into consideration the probability of a crack in a fuel tank not leaking due to crack closure, other structure, sealant, etc. Each operator can include the FUEL LEAK DTR in the TOTAL DTR.
EXPOSURE ALTITUDE DTR - Used in Sections 8.4 and 11.4 to take credit for the reduced vulnerability associated with those flap segments whose failure may jeopardize safe flight and landing due to insufficient recovery altitude only. A credit of 2 is included, where appropriate, because the risk exposure for these components is limited to certain short periods during final approach. The value, where applicable, is provided on the form. Each operator can include the EXPOSURE ALTITUDE DTR in the TOTAL DTR.
[20] TOTAL DTR - Used to add the total Δ DTR values, obtained from normal and supplemental inspections, to the fuel leak DTR.
[21] REQUIRED DTR - The level of DTR that must be equalled or exceeded by the TOTAL DTR in Block 20 for the SSI in Block 3.
[22] SIGNATURE BLOCK - Used for indicating the names of people completing, checking, revising, and approving the form. Dates should also be indicated. Operators can use alternative means more suitable to their own procedures for signing and approving maintenance programs.
7.0 DOCUMENT USAGE D6-82669 Original
Original D6-82669 7.0 DOCUMENT USAGE
7.3 Procedure for Completing a DTR Check Form
The following is a step by step procedure for completing a DTR Check Form. The blocks refer to those described in Section 7.2. DTR values should be rounded to the nearest tenth (0.1).
STEP 1 Complete Blocks 4 and 5, as appropriate.
STEP 2 Determine which inspection options, listed on the inspection instruction sheet are applicable to the SSI during normal maintenance. Opportunity inspections can be considered providing the typical repeat interval is known. Consider any obstructions that influence inspection visibility, as indicated by the notes (see also Sections 5.1.11 - 5.1.13).
STEP 3 For each STRUCTURE DETAIL, Direction and Method, having been selected in STEP 2, complete the INSPECTION PROGRAM DETAILS as follows:
a) Complete Block 12 with the CHECK LEVEL at which the structural inspection occurs;
b) Input the PERCENT of the fleet inspected in Block 14. If the inspection is part of a phased inspection program the PERCENT will be less than 100.
c) Input the FREQUENCY FLIGHT - F, in flight cycles in Block 15 (see Section 5.1.8). If flight hours or calendar periods are normally used, convert to flight cycles by using the average utilization of your active eligible fleet.
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