PPRuNe Forums - View Single Post - Mode S IAS readout
View Single Post
Old 12th Jan 2015, 21:23
  #15 (permalink)  
Skyjob
 
Join Date: Jan 2000
Location: FL410
Posts: 860
Likes: 0
Received 0 Likes on 0 Posts
The procedure starts by removing any automation from the aircraft:
- Disconnect Auto Pilot
- Disconnect Auto Throttle
- Flight Directors Off

Then advises the crew to achieve control as operative items include: N1% and pitch attitude, so:
- Set pitch and power depending on flaps extension or up

Now the aircraft is in a steady state, subject to weight will go up or down a little but these values are valid for all cross models.

Crew now has time to evaluate the situation and decide on further actions.

AVIATE, navigate, communicate...

To me it sounds Boeing has done a good job at marginalising the error of automation being left in and as per post of Winnerhofer above, determine what the problem is.
In the example above it was a faulty pitot not causing a master caution fault to appear, the reason for this as described earlier was an anomaly and reverse polarisation of the probe mitigates this problem heating the tip first rather then last.
In other cases it could be the ADIRU or another issue altogether.

Last edited by Skyjob; 14th Jan 2015 at 09:37. Reason: typo
Skyjob is offline