ADIRS Full/Fast Alignment Procedures

Question 1

ADIRS Full Alignment

10 Minutes

Answer 1

Required:

• FFOD (4 hour turnaround time)
• Previous flight had limited position monitoring (GPS or radio navaids unavailable)
• IRS drift error 5 NM or greater
• When required per Company Pages

[319/320]:
1. IR 1 - OFF (MIN 5 seconds)
then NAV

2. IR 2 - OFF (MIN 5 seconds)
   then NAV
3. IR 3 - OFF (MIN 5 seconds)
   then NAV
4. Verify all ALIGN lights - Steady ON
5. DISPLAY DATA - STS
6. DISPLAY SYS - 1, 2, 3
   (Check messages)
7. DISPLAY DATA - PPOS
8. ADR 1, 2, 3 - ON
9. Enter PPOS on MCDU INIT page
10. FMS database swap
11. INIT REQUEST - Select
12. IRS INIT page - Select
13. ALIGN ON REF - Press
14. GPS PRIMARY - Verify

[321C/N]:
1. IR 1 - OFF (MIN 5 seconds)
then NAV

2. IR 2 - OFF (MIN 5 seconds)
   then NAV
3. IR 3 - OFF (MIN 5 seconds)
   then NAV
4. ADR 1, 2, 3 - ON
5. FMS database swap
6. INIT REQUEST - Select
7. IRS INIT page - Select
8. GPS PRIMARY - Verify

Question 2

ADIRS Fast Alignment

3 Minutes

Answer 2

Accomplish:

• < 4 hour turnaround time
• IRS drift error < 5 NM

[319/320]:
1. IR 1 - OFF (< 5 seconds)
then NAV

2. IR 2 - OFF (< 5 seconds)
   then NAV
3. IR 3 - OFF (< 5 seconds)
   then NAV
4. Verify IR 1, 2, 3 ALIGN lights
   steady ON
5. DISPLAY DATA - STS
6. DISPLAY SYS - 1, 2, 3
   (Check messages)
7. DISPLAY DATA - PPOS
8. ADR 1, 2, 3 - ON
9. FMS database swap
10. INIT REQUEST - Select
11. IRS INIT page - Select
12. ALIGN ON REF - Press
13. GPS PRIMARY - Verify

[321C/N]:
1. IR 1 - OFF (< 5 seconds)
then NAV

2. IR 2 - OFF (< 5 seconds)
   then NAV
3. IR 3 - OFF (< 5 seconds)
   then NAV
4. ADR 1, 2, 3 - ON
5. FMS database swap
6. INIT REQUEST - Select
7. IRS INIT page - Select
8. GPS PRIMARY - Verify