PBN Ops

Question 1

How long is RAIM valid

Answer 1

72 hours

Question 2

How many satellites for RAIM

Answer 2

24 satellites, 5 required

Question 3

How many satellites visible for FDE

Answer 3

6

Question 4

Can approach be flow during RAIM outage period?

Answer 4

Yes, provided ANP is less than RNP and no other navigation alert is presented

Question 5

Pre RNP checks

Answer 5

Check RNP value
Confirm tracks and distances
Ensure DME updating is OFF

Question 6

Reasons for discontinuing apprach

Answer 6

Nav system flagged invalid (Verify Position, Unable Req Nav Performance-RNP, FMC Disagree)
Cross track error alert
ANP>RNP
Vertical deviation alert

Question 7

Pre RNP Approach checks/procedure

Answer 7

Confirm charted RNP 0.3
Check tracks, distances, altitudes, speed constraints, coded path angle.
Set DDA (MDA + 50ft)
Confirm charted temperature within limits
QNH from approved source
Verify vertical RNP 125ft
FMC DME updating deselected
PM selects terrain with VSD
Confirm 0.3 RNP by FAF

Question 8

Maximum vertical deviation on LNAV/VNAV Approach

Answer 8

Transient deviations of greater than 75ft ABOVE permitted during config changes
Any deviation exceeding 75ft BELOW path not permitted.

Question 9

When to set Missed Approach Altitude?

Answer 9

Set after established on final descent, more than 300ft below missed approach altitude.
Where a GP angle is coded from IAF-FAF, MAP Alt may be set intercepting GP