Oxygen System - P-8610021

T-1A AIRCRAFT SYSTEMS

CHAPTER TWO

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

travel.

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:

Normal

AIRCRAFT OVERVIEW

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