Leading Edge Devices Annunciator/IRS SYSTEM DISPLAY UNIT (ISDU)

Question 0

LE DEVICES ANNUNCIATOR PANEL

LE devices transit lights (Amber)

Answer 0

Corresponding LE device in transit

Question 1

LE DEVICES ANNUNCIATOR PANEL

LE devices EXT lights green

Answer 1

Corresponding LE slats in intermediate EXT position.

• normal with flaps 1, 2 or 5
• SFP 1, 2, 5, 10, 25

Question 2

LE DEVICES ANNUNCIATOR PANEL

LE devices full EXT lights (green)

Answer 2

Corresponding LE device fully extended
-max 230 kts

Fully extend after F5 (SFP after F25)

During retraction sequence is reversed

Indicate FULL EXT during auto-slat extension

-leading edge flaps
•two inboard of each engine
•move to FULL EXT as soon as trailing edge flaps are extended

Question 3

LE DEVICES ANNUNCIATOR PANEL

Leading edge devices hydraulic system

Answer 3

System B

Question 4

LE DEVICES ANNUNCIATOR PANEL

Indications if a LE flap or slat not in correct position

Answer 4

TRANSIT amber light comes on

Or

Incorrect EXT or FULL EXT green light on

Or

No lights

Question 5

LE DEVICES ANNUNCIATOR PANEL

QRH
LE Transit light on
-Limitations

Answer 5

-only one LE transit light on
•do not exceed 300kts or M.65, whichever is lowest

-more than one LE transit light on
•do not exceed 230kts

Question 6

IRS SYSTEM DISPLAY UNIT (ISDU)

Power system

Answer 6

28 vdc from left and right IRU/ADIRU

Question 7

IRS SYSTEM DISPLAY UNIT (ISDU)

Display selector:
TK/GS

Answer 7

Left window shows TRUE TRACK from 0°-359.9° (0.1° resolution)

Right window displays ground speed (knots)

Question 8

IRS SYSTEM DISPLAY UNIT (ISDU)

Display selector:
PPOS

Answer 8

Present position

Lat and Lon (0.1 minute resolution)

Question 9

IRS SYSTEM DISPLAY UNIT (ISDU)

Display selector:
WIND

Answer 9

Left window- wind direction (true)

Right window- wind speed kts (displays 100kts on ground)

Question 10

IRS SYSTEM DISPLAY UNIT (ISDU)

Display selector
HDG/STS

Answer 10

Heading / Status

Left window- true heading
Right window- any applicable IRU maintenance codes (last two digits)

Question 12

IRS SYSTEM DISPLAY UNIT (ISDU)

AIR DATA INERTIAL REF SYS (ADIRU)

Major components

Answer 12

2 ADIRUs
4 air data modules
1 ISDU (inertial system display unit)
1 MSU
6 static ports
3 pitot probes
2 angle of attack sensors
1 TAT probe

Question 13

LE DEVICES ANNUNCIATOR PANEL

What can illumination of the LEADING EDGE FLAPS TRANSIT light indicate?

Answer 13

One or more of these occur:

• Any LE device in transit
• Leading edge devices are not in the commanded position
• LE uncommanded motion exists (2 put more LE flaps or slats have moved from commanded position)
• During alternate extension until LE devices are extended and TE flaps reach F10