MANUAL VENTING OF THE AIRCRAFT PITOT AND STATIC SYSTEMS
[EN] English 77 K0553 Revision D
The order the manual let-down valves are opened is:
Figure 3-27: Manual let-down ADTS542F and ADTS552F
Figure 3-28: Manual let-down ADTS553
Number of
Channels Application 1st Valve open 2nd Valve open 3rd Valve open 4th Valve open
2 Pitot & Static Pt to Ps (A) Ps to Atm (B) N/A N/A
Number of
Channels Application 1st Valve open 2nd Valve open 3rd Valve open 4th Valve open
3Smart Probe
Angle of Attack
Ps2 to Ps1 (A) Pt1 to Ps1 (B) Ps1 to Atm (C) N/A