unclassified - Air Force Financial Management & Comptroller

BUDGET ITEM JUSTIFICATION (EXHIBIT P-40)
UNCLASSIFIED
DATE:
FEBRUARY 2002
APPROP CODE/BA:
OPAF/ELECTRONICS & TELECOMMUNICATION EQUIPMENT
P-1 NOMENCLATURE:
COMM ELECT MODS
Description (continued):
A. AN/GRN-30 Instrument Landing System (ILS) Antenna/Distribution Unit: The GRN-30 ILS antennas, antenna distribution unit, and
monitor combining unit are becoming logistically unsupportable. The antenna distribution units have been rebuilt numerous times and provide
an unstable and erratic output. Many of the distribution units in the field are out of technical order specification but remain in service because
replacements are not available or rebuilt ones are more out of tolerance than the ones in the system. The integral detectors in the monitor
combining unit have been the single high failure part of the ILS system for years. FY01-03 funds procure this modification, which increases ILS
operational availability, reducing risk that aircraft will be required to divert to other bases or attempt landings at night and/or in hazardous
weather conditions without landing assistance, and ensures expeditious recovery of combat/training sorties.
B. AN/TRN-41 TECHNICAL UPGRADE: Existing equipment design and construction is of 1970s technology, and contains obsolete
components that can no longer be procured. This equipment is projected to be the only deployable TACAN in the Air Force inventory;
this modification will extend the service life of the system. In addition, existing tripods will not support long term deployments and must be
replaced.
C. AN/TPN-19, Landing Control Central (LCC) RESHELTER: Two systems have been re-sheltered, two are in progress. This re-sheltering
is necessary due to compromise of existing shelter integrity and environmental control. A common ISO shelter is used and all hardware is
re-sheltered.
D. MISCELLANEOUS LOW COST MODIFICATIONS: FY01-03 funding procures/installs a variety of operations-related modifications,
which include, but are not limited to, the following: (1) Improve sustainability of line replaceable units (LRU) and provide replacement of
unsupportable power supplies on the AN/TPN-19. (2) Modification of the mobilizer on the AN/TPN-19 to meet the tow requirements of 17,000
pounds minimum to 20,000 pounds maximum (3) Flight Data Input/Output modification necessary for USAF locations to connect to the FAA
Air Route Terminal Control Centers. The Federal Aviation Administration is currently upgrading the displays, printers, and keyboards. (4)
Replacement of the current Automatic Terminal Information Service (ATIS) due to parts obsolescence. Parts for the ATIS are no longer
available for procurement, and the cost to reverse engineer would exceed the unit acquisition cost tenfold. (5) Procure a phase control unit, for
the AN/GPN-12/20, which can be attached directly onto the drive motor to adjust the input phase and the rotation speed of the antenna. (6) The
P-1 ITEM NO PAGE NO:
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UNCLASSIFIED
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