M
V
A
ANUAL
ENTING OF THE
IRCRAFT
Number of
Channels
Application
4
Pitot & Static
Pilot & Copilot
103
P
S
S
ITOT AND
TATIC
YSTEMS
Figure 3-29: Manual let-down ADTS554F
1st Valve
open
Pt2 to Ps2 (B)
2nd Valve
3rd Valve
open
Pt1 to Ps1 (C)
Ps2 to Ps1 (A)
4th Valve
open
open
Ps1 to Atm
(D)