Air Mobility Plan, 2008 - The Black Vault

C-5 Roadmap
(b)(5)
Enhanced Surveillance/IFF Mode 5
Enhanced Surveillance (EHS) expands the capability of elementary surveillance by requiring the
following additional information: selected vertical intention, track and turn report, and heading and
speed report. Selected vertical intention includes barometric pressure setting and the altitude to which
the aircraft has been cleared. The track and turn report includes roll angle, true track angle, ground
speed, track angle rate, and true airspeed. The heading and speed report contains magnetic heading,
indicated airspeed, Mach number, barometric altitude rate, and inertial vertical rate. The Flight
Management System (FMS) software in the VIA/AIU requires updating. EHS is designed to improve
airspace safety by reducing ground controller workload, which continues to increase exponential as
airspace utilization increases. The international civil aviation organization (ICAO) mandate for these
functions is March 2009.
IFF Mode 5 is a new military identification program that is being implemented DOD-wide. The AF
plans to begin the C-5 implementation in FY10 with the entire fleet completed by FY15. Mode 5
provides longer range, improves range accuracy, increases security against exploitation and spoofing,
improves identification of friend and foe, reduces garbling and mutual interference, and reduces IFF
interference with civil air traffic control systems. The current Mode IV IFF is not Airborne Information
Management System (AIMS)-certified which also poses future certification issues.
Selective Availability Anti-Spoofing Module
SAASM is an anti-tampering capability that significantly enhances the GPS precise positioning
service (PPS) signal security. It consists of an architecture change to the GPS navigation receiver
that essentially eliminates the probability that the GPS navigation signal can be compromised with
current spoofing equipment. SAASM allows for unclassified black key encryption security systems
as opposed to the classified red key encryption security system used today. SAASM uses crypto-nets
which allow mission planners to tailor sets of receivers that could receive PPS signals. SAASM
allows for automatic over-the-air re-keying of black key encryption which significantly reduces
security requirements.
Troop Floor Corrosion Prevention
Stress panels in the troop compartment latrine have significant corrosion. To replace the panels,
maintenance personnel must remove the entire latrine. This causes a 3-week PDM delay. PDM
will install the C-5B-designed latrine on the C-5A. The C-5B latrine has a one-piece fiberglass floor
pan, fiberglass walls, and a larger holding tank. Thirteen C-5A aircraft kits have been installed.
PDM currently has kits ready for installation. AMC programmed kit installation through the R&PC
process. The requirement is approximately $2.3 million.
TF39 Thrust Reverser End Shoe/Slider Support Beam
Program is applicable to C-5 aircraft that will be flying TF-39 engines. It eliminates the track jumping
failure mode of the thrust reverser. Track jumping is caused by the translating cowl end shoe pulling
away from the pylon beam wear surface under load and engaging the side of the beam when the
reverser is stowed. The engagement can result in an asymmetrical stow and damage to the unit. The
slider support beam modification will extend the overlap engagement point of the translating cowl
(the “end shoe”) from approximately a .5 inch to a 1.5 inch wear surface by affixing a slider beam to
the pylon beam assembly.
56
FOR OFFICIAL USE ONLY (FOUO)
OCT 07