Honeywell PRIMUS 1000 - Cabin Pressure and Auxiliary Power Unit (Apu) Status; Cabin Pressurization; Color Differential Pressure Display

PRIMUSr 1000 Integrated Avionics System
A28--1146--112--00
Engine Instrument and Crew Alerting System (EICAS)
5-18
CABIN PRESSURE AND AUXILIARY POWER UNIT (APU)
STATUS
Cabin pressurization and the APU status are displayed in the lowerleft
corner of the EICAS. The annunciations are described below.
D Cabin Pressurization -- Cabin climb/descent rate is displayed in
feetperminute(fpm).Cabinpressuredifferentialisdisplayed inPSI.
Cabin altitude is displayed in feet. All displays are cyan. The
resolution of the cabin settings are as follows:
- Climb/descent rate: 50 fpm
- Pressure differential: 0.1 PSI
- Altitude: 100 ft.
When cabin pressure differential exceeds its limits, the pressure
differential digits turn amber in an amber box or red in a red box.
Whencabinaltitude exceeds 8100 feet,the cabinaltitude digitsturn
amber in an amber box. WHen cabin altitude exceeds 10,000 feet,
the digits and box turn red.
The cabin altitude rate has a range of from --2000 feet per minute
(fpm) to +2000 fpm in 50--foot increments. It is displayed in green.
Cabin pressure differential (PD) ranges from --0.4 PSID to + 10.00
PSID. The colors of the digital display are described in table 5--14.
Value (PSID) Color
--0.5 to --0.4 Red
--0.3 to --0.1 Amber
0.0 to +7.9 Green
8.0 to 8.3 Amber
> 8.4 Red
Color Differential Pressure Display
Table 5--14
D APU Status -- The APU status consists of the APU turbine speed
and the APU exhaust temperature. The APU annunciation and
labels are white. The digits follow the logic given intables 5--15and
5--16 .