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2.73 FREE-AIR TEMPERATURE (FAT) INDICATOR.
The free-air temperature indicator is a direct reading in-strument marked FREE AIR, and reads in degrees Celsius. Two FAT indicators are installed through the overhead windows (Figure 2-4).
2.74 CLOCK.
Two digital clocks (Figure 2-8) may be installed on the instrument panel. The clock incorporates a six digit liquid crystal display, 24 hour numerals and sweep second indi-cation. A battery allows continuous operation for a mini-mum of one year when aircraft 28 vdc power is not applied. The clock has two modes of operation, clock mode (C) and the elapsed time mode (ET). Power to operate the clock is provided by the No. 1 dc and No. 2 dc primary buses through circuit breakers marked CPLT ALTM and PILOT ALTM respectively.
2.75 MASTER WARNING SYSTEM.

Master caution lights will not illuminate if both MFDs have failed.

Two master caution lights (Figures 2-8 and 2-21) one each side for the pilot and copilot, marked MASTER CAUTION PRESS TO RESET, are on the master warn-ing panel. They light whenever a caution legend goes on. These lights alert the pilots and direct attention to the caution/advisory grid. The master caution lights should be reset at once to provide a similar indication if a second condition or malfunction occurs while the .rst is still present. The master caution light can be reset from either pilot position. Four amber warning lights, also on the mas-ter warning panel, require immediate action if they go on. The markings are #1 ENG OUT, #2 ENG OUT, FIRE, and LOW ROTOR RPM. The LOW ROTOR RPM warning light will .ash at a rate of three to .ve .ashes per second if rotor rpm drops below 96% RPM R. In addition, if % RPM R drops below 96% or Ng drops below 55%, a low steady tone is provided. The low rotor rpm tone is inhibited on the ground through the left landing gear weight-on-wheels switch. The engine Ng steady tone is not inhibited. The ENG OUT warning lights and tone will go on at 55% Ng SPEED and below. Refer to paragraph 2.11.1
2-68 Change 2

 

#2 ENG OUT

MASTER CAUTION
LOW ROTOR PRESS TO RESET
RPM
AA0406
SA

Figure 2-21. Master Warning Panel
for description of the FIRE warning lights. Power for the master caution lights is provided from the No. 1 dc primary bus through a circuit breaker, marked LIGHTS ADVSY.
2.75.1 Caution/Advisory Legend System. Caution and advisory legends appear in the MFDs and CDU. Press-ing ILLUM ALL soft key on the MFD displays the caution/advisory grid. Caution legends indicate malfunc-tions or unsafe conditions, and are displayed in yellow. Noncritical advisory legends are displayed in green. Some cautions will also generate a LAND ASAP message in the MFD. Caution legends appear in reverse video until acknowledged, which is done by pressing ACK soft key. When the MFD has other displays active, cautions and advisory messages are displayed in a pop up window. Cau-tions appear in 9last in, .rst displayed9 order, with the most current caution at the top of the list. The most recent advi-sory is at the top of the advisory list, which is below the last caution. Cautions are separated from advisory legends by a row of asterisks. Refer to major systems for a complete description of caution-advisory legends. Refer to Table 2-3 for a brief description of each fault.
2.75.2 CDU Caution/Advisory Grid. A caution/ advisory grid is also displayed on the CDU as a backup to the MFD grid. Press CAU/ADV .xed function key to view active caution and advisory legends. When the caution advisory display is present, the CDU keyboard is disabled. Press CAU/ADV, or acknowledge the caution legend from the MFD to return to the previous display. Caution and advisory legends have the same meanings as those on the MFD (Table 2-3).
2.75.3 Caution/Advisory BRT/DIM -TEST Switch.
Testing of the caution/advisory display is done through a momentary spring-loaded to center switch marked INDI-CATOR LTS BRT/DIM and TEST, on the instrument panel (Figure 2-8). Placing the switch to TEST simulta-neously checks legends on the caution/advisory display and the master warning panels. The LOW ROTOR RPM warning lights will .ash. During caution/advisory test, when the TEST switch is released from the TEST position, the master caution lights will .ash approximately 16 times to indicate that the transmission drive train chip caution panel circuits are going through self-test. An existing mal-function within those circuits will prevent .ashing of the master caution lights and the respective chip caution legend will .ash. The master caution warning lights should be reset at once to provide a similar indication if a second condition or malfunction occurs while the .rst condition is present. When the pilot’s PILOT FLT rotary intensity control is moved from the OFF position, placing the INDICATOR LTS BRT/DIM-TEST switch to BRT/DIM causes the caution/advisory legends and master warning lights to change intensity. When the lights are dim and power is removed, the light intensity will return to bright when power is reapplied. The TEST switch position receives power from the No. 1 dc primary bus through a circuit breaker, marked LIGHTS ADVSY. Dimming of the cock-pit indicator lights operates with the caution dimming sys-tem.
　
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