Annunciator Test Switch

CHAPTER TEN

T-34C AIRCRAFT SYSTEMS FAMILIARIZATION

WORKBOOK

Fault lights are steady illumination, yellow lights located on the annunciator panel at the bottom

of the instrument panel in both cockpits. The panel consists of two columns of four lights that

visually identify the existence of a specific fault. The individual lights are labeled INVERTER,

GENERATOR, L FUEL LOW, R FUEL LOW, FUEL PRESS, CHIP, LDG LIGHT, and

BLEED AIR. A fault light will extinguish only when the condition that caused the light to

illuminate is corrected.

Master Caution Light

The master caution light is located at the top of the instrument panel above the airspeed indicator

in each cockpit. It is a yellow flashing light that illuminates the words MASTER CAUTION.

When flashing, the light alerts the pilot to scan the annunciator panel for an illuminated fault

light. The master caution light can be extinguished by correcting the fault that caused it to

illuminate or by depressing the face of the light.

Function Lights

Function lights are steady-illumination, green lights that visually identify the existence of a

specific function. They are located beneath the fault lights on each annunciator panel and

labeled IGNITION and AUTO IGN. When illuminated, the IGNITION light indicates that the

ignition system is operating and the AUTO IGN light indicates that the autoignition system is

armed. The function lights do not activate the MASTER CAUTION light.

Annunciator Test Switch

The annunciator test switch is located below the annunciator panel in the center of the TEST

panel in each cockpit. It is a push-button type switch that tests the illumination of the landing

gear handle, WHEELS, MASTER CAUTION, inboard gear door position indicator, fault and

function lights. The WHEELS and MASTER CAUTION lights flash while the landing gear

handle, inboard gear door position indicator, fault and function lights do not. The switch tests

the lights only in the respective cockpit.

Interior Lighting

The interior lighting system consists of individual instrument post lights, utility lights, console

lights, instrument and console flood lights. All interior lighting is white with the exception of the

utility light, which has optional red lighting. All interior lighting is operated by DC power.

Instrument Lights

All instruments are lighted externally by post lights located on the upper left and right corner of

each instrument, and instrument floodlights located beneath the glare-shield in each cockpit. The

lights are controlled by individual rheostats located on the interior lights control panel, right

console, both cockpits. The rheostats have a group labeled INST with individual labels LTS

10-4

ELECTRICAL SUBSYSTEMS