T-1A AIRCRAFT SYSTEMS
The fore/aft and vertical adjustment levers are located below the forward edge of the seat
cushion. When the lever on the right is lifted, the seat track lock is released so the seat can be
repositioned fore and aft along the track. When the lever on the left is lifted, and no weight is on
the seat, the seat will rise in half-inch increments until the lever is released or the highest point of
travel is reached. If weight is on the seat, when the lever is lifted, the seat will move downward
in half-inch increments until the lever is released or the seat reaches the lowest point of vertical
The shoulder harness locking handle is located beside the seat cushion on the inboard side of
each seat. The locking handle is used to manually lock the inertia reel prior to making shoulder
harness strap adjustments, and when inertia reel locking is deemed necessary.
Crew Seat Restraint System
All crew seats are equipped with a five-point restraint system, including shoulder harness and
inertia reel, lap belt, crotch strap, and five-point quick release buckle. The belt buckle is
permanently attached to the belt webbing on the outboard side of the P and CP seats, and the
right side of the jump seat. The buckle quick releases all four-strap fasteners with a single
movement of one-quarter turn of the buckle.
206. OXYGEN SYSTEM
The oxygen system is a high-pressure system, which maintains a normal operating pressure
between 1600 and 1850 psi and provides oxygen for the crew and passengers. The system is
fully operational between 0 and 41,000 feet. To monitor this pressure, two pressure gauges are
provided. One gauge is located below the lower right corner of the CP instrument panel. The
other gauge is located in the oxygen service panel in the right forward nose section.
To provide information of an over-pressure situation, the system incorporates a green Overboard
Oxygen Discharge indicator. The indicator is located on the right side of the nose section. The
disk will be blown out once the pressure within the system reaches approximately 2700 psi.
The oxygen system is divided into two subsystems:
The crew oxygen subsystem
The passenger oxygen subsystem
Crew Oxygen Subsystem
Three quick-donning diluter masks are provided for the flight crew and are stowed on quick
release straps beside the P, CP, and jump seat positions. A regulator installed in the mask has
three modes of operation: