4-26
CPCS Low Cabin Mode Operation
A semi-automatic mode called ‘Low Cabin’ is available, whereby the pilot can use Landing
Field Elevation (LFE) as the target cabin altitude. The targeted cabin altitude can be the
automatic LFE value from the FMS or the manually entered LFE. Low Cabin mode can be
selected on the ENVIRONMENT window of the systems MFD. As soon as the LOW CAB
annunciator comes on, the cabin altitude is controlled to maintain the LFE selected value,
limited only by the maximum pressure differential of 5.75 psi (depending on cruise altitude).
From this cruise altitude upwards, the cabin altitude will increase to maintain max Dp.
The following Table gives the aircraft altitude for a selected LFE from which upwards the
maximum pressure differential of 5.75 psid will be reached and maintained.
Selected LFE (ft)
Aircraft altitude with max Dp 5.75 psid
-2000
10000
-1500
10700
-1000
11400
-500
12100
SL
12900
500
13600
1000
14400
1500
15200
2000
16000
2500
16800
3000
17600
3500
18400
4000
19250
4500
20100
5000
20900
5500
21800
6000
22600
6500
23500
7000
24400
7500
25300
8000
26200
8500
27100
9000
28100
9500
29000
10000
30000
Section 4 - Normal Procedures (EASA Approved)
CPCS Low Cabin Mode Operation
Pilot's Operating Handbook
Report No: 02406
Issue date: Mar 06, 2020
Page 4-26-1
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