Dual IRS or ADR failures will cause the loss of A/P and A/THR. Flight controls will be in
alternate law without protections and at landing gear extension will revert to direct law. With
any of the three dual IRS failures attitude information will be lost on one PFD. It is essential
that both pilots cross-check attitude and air data with the standby instruments.
A triple IRS or ADR failure is very unlikely. Triple failures will not be displayed on ECAM.
Only two double failures will be displayed (i.e. ADR 1 + 2 FAULT and ADR 2 + 3 FAULT).
Following ECAM actions would give conflicting instructions. Follow the procedure for
ADR 1 + 2 + 3 failure contained in QRH 2.16. This is one of the few cases where the crew
will not follow ECAM.
There is no procedure for IRS 1 + 2 + 3 failure but the ECAM status page will give approach
procedure and inoperative systems. In this unlikely eventuality, standby instruments are the
only attitude, altitude, speed and heading reference.
A319/A320/A321 FLIGHT CREW TRAINING MANUAL ABNORMAL OPERATION BRIEFINGS NAVIGATION 1.03.34 Page 2
REV 21 MAY 98
06 - COMPLETION STANDARDS
.
Carries out required ECAM drills in accordance with SOPs.
.
Recognizes triple ADR failure and uses QRH for drill.
.
When flying on standby instruments achieves a reasonable level of accuracy
07 - COMMON ERRORS
.
Fails to recognize triple ADR or IRS failure
.
Poor flying accuracy when using standby instruments
A319/A320/A321 FLIGHT CREW TRAINING MANUAL ABNORMAL OPERATION BRIEFINGS NAVIGATION 1.03.34 Page 3
REV 21 MAY 98
01 - TRAINING OBJECTIVE
.
To be aware of approach and landing capabilities.
.
To understand effects on auto-pilot, FD, approach mode and flight controls.
.
To carry out instrument or visual approach and landing in direct law.
02 - SCHEDULE
Briefing duration : 10 minutes
03 - EQUIPMENT
DOC references :
.
FCOM 1.34.40 (Radio altimeter)
.
FCOM 1.22.30 (Auto flight)
.
FCOM 3.02.27 (Direct law procedure)
.
FCOM 3.02.34 (RA 1 +2 fault procedure)
.
Briefing Note - ILS raw data approach
04 - INSTRUCTOR’S ACTIONS
Briefing of the following key points.
MAIN
.
Effects of failure/gear position on auto-pilot, FD, approach mode and flight controls.
.
Approach and landing in direct law.
.
Raw data approach (reminder).
.
Flight controls logic.
SECONDARY
A319/A320/A321 FLIGHT CREW TRAINING MANUAL ABNORMAL OPERATION BRIEFINGS NAVIGATION 1.03.34 Page 4
REV 21 MAY 98
05 - TRAINEES’ ACTIONS
GPWS is lost, therefore apply extra caution with regard terrain. The autopilot is available until the gear is lowered.
It should be noted that the flight director will not be able to capture and track the glideslope (FCOM 1.22.30 [Auto Flight - Flight Guidance]). However be careful of following flight director commands close to the ground as it will command excessive roll rates. Interception of the localiser may be done using LOC but the final stages of the approach should be flown using raw data to avoid excessive roll rates if LOC is still engaged.
The approach and landing are only to Cat 1 limits, bearing in mind that the aircraft will revert to DIRECT law when the gear is lowered. As with most cases reverting to DIRECT law, it is advisable to set CONFIG 3 before lowering the gear so that the aircraft is in trim when DIRECT law becomes operative.
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