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Page Title:
FSR & PCU Moisture Design and Packaging |
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|  MIL-V-81995/6(AS)
The minimum ATS speed following a step load decrease shall not be less
than 49 percent.
Operating Conditions:
Maximum ATS Accessory Load
90HP
25HP
Minimum ATS Accessory Load
Maximum Step Load Change
59HP
0.04135
(slug-ft)
System Inertia Reference to ATS
Duct Volume Upstream of ATSCV
148
Duct Volume Downstream of ATSCV
Rated
ATSCV Air Inlet Conditions
Rated
ATS Torque Characteristics
The system shall function in the aircraft and be compatible with the
air supply system to provide speed control while the aircraft is on the ground.
Speed control shall not operate in other than ground maintenance mode.
FSR & PCU Moisture Design and Packaging. The FSR shall be designed to
minimize the collection of moisture encountered when the equipment bay doors
are open. Use of seals, baffles, and placement of internal components shall
be considered to improve moisture protection. Modes of entrance of moisture
shall be studied and eliminated as much as practicable. Sufficient area shall
be provided for drainage of entrapped moisture, with equipment in the normally
installed position.
The FSR will be considered non-repairable and may be hermetically
sealed. No adjustments are required.
PCU Control. The FSR shall incorporate a single output providing low side
(28 vdc return) control of the selected PCU. The right or left PCU circuit
will be selected through external switching provided by the aircraft.
Interchangeability.
The ATSCV and its components, FSR and PCU, shall be
physically interchangeable or replaceable with any other manufacturer listed
on the applicable Qualified Products List (QPL).
Useful Life. The equipment shall have a useful life of not less than 15
years under any combination of operating and storage life without exceeding
the operational service life.
Operational Service Life. The equipment shall have an operational service
life of not less than 7,800 hours including 6,300 main engine starts and 2,400
ground maintenance operations of 30 minutes duration under any natural
combination of environmental conditions specified herein. Service life for
the purpose of this equipment shall hereafter be considered in terms of
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