AFGS-87219 Electrical Power Systems, AircraftThis specification establishes the performance requirements and verifications for electric power subsystems EPS for aerospace vehicles, including aircraft, helicopters, and missiles.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46 - 47 - 48 - 49 - 50 - 51 - 52 - 53 - 54 - 55 - 56 - 57 - 58 - 59 - 60 - 61 - 62 - 63 - 64 - 65 - 66 - 67 - 68 - 69 - 70

A.3.5    Maintainability.

AFGS�87219B APPENDIX A

The EPS maintainability requirements shall be as follows: ------------.

REQUIREMENT RATIONALE (A.3.5)

The maintainability of the electric power subsystem is one of the factors contributing to the overall maintainability of the total aircraft system.  Therefore, limits on maintenance tasks and associated times to accomplish them should be established for the EPS and its components.

REQUIREMENT GUIDANCE (A.3.5)

Consult the overall system Maintainability Monitor for assistance in establishing maintainability requirements.  Refer to MIL-HDBK-470 for maintainability program guidance.

REQUIREMENT LESSONS LEARNED (A.3.5)

Easy access to EPS components is an essential factor for effective maintenance.  Problems with maintaining proper oil level in the one aircraft integrated drive generators were attributed in part to the poor accessibility of the installation.  Careful attention must be given to this area.

A.4.5    Maintainability.

Compliance with the maintainability requirements of 3.5 shall be verified by analyses and demonstrations as follows: ------------.

VERIFICATION RATIONALE (A.4.5)

Subsystem and component analyses and demonstrations are the appropriate means for verifying subsystem maintainability.

VERIFICATION GUIDANCE (A.4.5)

Specify the maintainability analyses and demonstrations which are necessary to ensure that maintainability requirements are met.  Consult the system Maintainability Monitor for additional guidance.  Refer to MIL-HDBK-470 for maintainability demonstration procedures and methods.

VERIFICATION LESSONS LEARNED (A.4.5)

Early maintainability demonstrations of the oil quantity gage on one aircraft would have shown that it was impossible for ground maintenance to obtain accurate readings due to the gage's poor location.  Bad readings resulted in many generator failures before the quantity gage was finally relocated.

60