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The Integrated Standby Instrument System (ISIS) is a combined standby altimeter, horizon indicator and AirSpeed Indicator (ASI). It displays the following information:

4 airspeed, 4 mach number, 4 pitch and roll angles, 4 altitude in feet,

4 Glide Slope (G/S) and LOCalizer deviations.

4 BAROmetric reference in hectopascals (hPa).

Optionally, it displays:

4 metric altitude, 4 magnetic heading,

4 BARO correction in inches of mercury in addition to the BARO correction in hectopascals.

A light sensor on the ISIS front face automatically controls the display brightness. As soon as the ISIS is energized, it shows the initialization display for 90 s. This display has four yellow boxes indicating ATTitude, SPeeD, ALTitude and INIT 90 s.

TDTI / DIP Issue: 12/08 Revision: 17.12.2008 ATA 34-00-00 Page 30

AIRBUS A318/319/320/321

CFM 56 / Level 3 Austrian Technical Training

School Notes - For Training Purposes Only

GEGENNEERRAALL

AIRBUS A318/319/320/321

CFM 56 / Level 3 Austrian Technical Training

School Notes - For Training Purposes Only

STANDBY AIRSPEED INDICATOR FUNCTION

The standby airspeed indicator function measures the pitot/static pressure differential from the standby air data system and gives the airspeed indication in knots (kts). The airspeed indicator is shown vertically with a linear scale from 0 to 520 kts. This scale moves up and down in front of a fixed yellow triangle indicating the A/C actual airspeed. When the airspeed data is not valid, the airspeed scale is replaced by a red SPD flag. When the mach number is above 0.5, it is shown in green in the left bottom part of the display area, just below the speed scale. In case of failure, a red M flag is shown instead of the mach number.

TDTI / DIP Issue: 12/08 Revision: 17.12.2008 ATA 34-00-00 Page 32

AIRBUS A318/319/320/321

CFM 56 / Level 3 Austrian Technical Training

School Notes - For Training Purposes Only

STSTAANNDDBBYY AAIIRRSSPPEEEEDD IINNDDIICCAATTOORR FFUUNNCCTTIIOONN

AIRBUS A318/319/320/321

CFM 56 / Level 3 Austrian Technical Training

School Notes - For Training Purposes Only

STANDBY ALTIMETER FUNCTION

The standby altimeter indication is supplied with static pressure by the standby air data system to indicate the barometric altitude of the aircraft in feet (ft). The altitude indicator is shown vertically with a linear scale from - 2.000 to + 50.000 ft. This altitude scale moves up and down behind a window with a yellow border indicating the A/C actual altitude value in green digits. When the altitude data is not valid, the altitude scale is replaced by a red ALT flag. If the altitude is NEGative, the NEG indication is shown in white near the digital read-out. The range is - 2.000 to 0 ft. Optionally the metric altitude is shown in the right top part of the display in addition to the altitude in feet. The metric altitude indication is shown in green by means of the digital read-out surrounded in yellow. The cyan letter M is written next to the altitude value. In case of negative altitude, the NEG indication is shown in white in front of the metric altitude value.

TDTI / DIP Issue: 12/08 Revision: 17.12.2008 ATA 34-00-00 Page 34

AIRBUS A318/319/320/321

CFM 56 / Level 3 Austrian Technical Training

School Notes - For Training Purposes Only

SSTATANNDDBBYY AALLTTIIMMEETTEERR FFUUNNCCTTIIOONN

AIRBUS A318/319/320/321

CFM 56 / Level 3 Austrian Technical Training

School Notes - For Training Purposes Only

REFERENCE BAROMETRIC PRESSURE INDICATION

Pushing the BARO reference selector knob in the bottom right corner of the indicator lets the crew select the standard BARO pressure. STD is shown in cyan below the attitude display in the bottom center of the display. Pushing it again makes the selection of the QNH (sea level atmospheric pressure) BARO reference in hectopascals. The selected BARO correction value is shown in cyan in place of STD. Rotating the BARO selector knob sets the corrected value in the range from 745 to 1100 hPa. Optionally the BARO correction value can be shown in inches of mercury (in.Hg). It is shown in cyan, in addition to the BARO correction value in hectopascal. The BARO selector knob is used for the display and the adjustment of the reference BARO correction in the range from 22 to 32.48 in.Hg.

TDTI / DIP Issue: 12/08 Revision: 17.12.2008 ATA 34-00-00 Page 36

AIRBUS A318/319/320/321

CFM 56 / Level 3 Austrian Technical Training

School Notes - For Training Purposes Only

REREFFEERREENNCCEE BBAARROOMMEETTRRIICC PPRREESSSSUURREE IINNDDICICAATTIIOONN

AIRBUS A318/319/320/321

CFM 56 / Level 3 Austrian Technical Training

School Notes - For Training Purposes Only

STANDBY HORIZON

The A/C symbol is in black and outlined in yellow. It gives a fixed reference for the moving pitch scale and roll indication. The basic A/C symbol can be optionally replaced by the V-bar symbol when the related pin-program discrete is grounded. Pitch angles are shown with reference to the fixed A/C symbol. At angles greater than 30 degrees nose up or down, red large arrow heads indicate an excessive attitude and the direction to follow in order to reduce the pitch angle. Roll angle is shown with reference to a fixed roll scale and yellow triangle as index. The scale has white marks at 10, 20, 30, 45 and 60 degrees on either side of the zero position, which is indicated by a small black triangle with white outline, it is the roll indicator. As the A/C rolls left and right, the roll angle indicator moves across the fixed scale. A trapezoidal index, which can move beneath the roll indicator, represents the A/C lateral acceleration (sideslip). In case of failure of the pitch or roll information, the attitude display is replaced by a red ATT flag. The optional magnetic heading display is a moving white scale against a fixed yellow triangle as reference. In case of failure of the magnetic heading information, the magnetic heading display is replaced by a red HDG flag.

TDTI / DIP Issue: 12/08 Revision: 17.12.2008 ATA 34-00-00 Page 38

AIRBUS A318/319/320/321

CFM 56 / Level 3 Austrian Technical Training

School Notes - For Training Purposes Only

STSTAANNDDBBYY HHOORRIIZZOONN

AIRBUS A318/319/320/321

CFM 56 / Level 3 Austrian Technical Training

School Notes - For Training Purposes Only

LS AND BUGS FUNCTION

When the Landing System P/B located on the right top part of the indicator is pushed the G/S and the LOC scales come into view. In case of failure of the G/S or LOC information, the related display is replaced by a red G/S or LOC flag. Pushing the BUGS P/B shows the BUGS display. This display is used to program characteristic speeds and altitudes displayed on the related speed and altitude scales. Pushing the BARO selector knob de-activates a bug and the OFF indication is shown next to the de-activated bug. Pushing it again re-activates the bug. Rotating the BARO selector knob sets the required bug value.

Pushing the (-) P/B enables to move down to the next bug and the (+) P/B to move up to the previous bug. The ReSeT P/B is used to reset the attitude values during stabilized flight (no pitch or roll angles and with stabilized speed). It is also used in the different menus, as a

"return" function.

TDTI / DIP Issue: 12/08 Revision: 17.12.2008 ATA 34-00-00 Page 40

AIRBUS A318/319/320/321

CFM 56 / Level 3 Austrian Technical Training

School Notes - For Training Purposes Only

LLS S AANNDD BBUUGGSS FFUUNNCCTTIIOONN

AIRBUS A318/319/320/321

CFM 56 / Level 3 Austrian Technical Training

School Notes - For Training Purposes Only

ISIS MENUS

The ISIS indicator is able to display maintenance data when the BUGS and LS P/Bs are pushed simultaneously at least 2 s. In this case, a menu with two items is shown on screen: TESTS and OTHER DATA.

The P/Bs adjacent to these items give access to the related menus.

The OTHER DATA menu is made of two items: LRU IDENT and ENGINEERING DATA. When the (+) P/B next to the LRU IDENT item is pushed, the display shows the:

4 ISIS Part Number (PN) and the Serial Number (SN), 4 A/C configuration (active options),

4 functional time counter (operating hours).

When the (-) P/B next to ENGINEERING DATA is pushed, the display shows the:

4 ATA reference and time,

4 component identification and Functional Item Number (FIN), 4 failure code data.

If there is more than one data page, pushing the (+) or (-) P/Bs enables to go to the next or previous data pages. Pushing the RST P/B enables to return to the previous menu page. Pushing the RST P/B several times restores the operational display. The TESTS menu gives access to the FUNCTIONAL TEST and DISPLAY TEST.

NONOTTEE:: TTHHEE IISSIISS HHAAS S AANN IINNTTEERRNNAALL FFLLIIGGHHTT//GGRROOUUNNDD LLOOGGIICC,,

AIRBUS A318/319/320/321

CFM 56 / Level 3 Austrian Technical Training

School Notes - For Training Purposes Only

ISISISIS MMEENNUUSS

AIRBUS A318/319/320/321

CFM 56 / Level 3 Austrian Technical Training

School Notes - For Training Purposes Only

ISIS INTERFACES (3)