High Pressure Controller

 (a)  
Valve position is indicated by one of the following messages: CLOSED (valve is closed) OPEN (valve is open)

 (b)
For invalid valve position data, the message is removed.High Pressure Valve

 (a)  
Valve position is indicated by one of the following messages: CLOSED (valve is closed) OPEN (valve is open)

 (b)
For invalid valve position data, the message is removed.Pressure Regulating Valve

 (a)  
Valve position is indicated by one of the following messages: CLOSED (valve is closed) OPEN (valve is open) REGLTG (calve is regulating)

 (b)
For invalid valve position data, the message is removed.Engine Duct Pressure

 (a)  
Duct pressure for each engine is displayed by digital readouts

 in units of psi.Precooler Outlet Temperature

 (a)
Displayed in units of °C (Celsius).Fan Air Valve

 (a)  
Valve position is indicated by one of the following messages: CLOSED (valve is closed) OPEN (valve is open) REGLTG (valve is regulating)

 (b)
For invalid valve position data, the message is removed.Starter Valve

 (a)  
Valve position is indicated by one of the following messages: CLOSED (valve is closed) OPEN (valve is not closed)

 (b)  
For invalid valve position data, the message is removed.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

 (9)  
Pressure Regulating Shutoff Valve

 (a)  
Valve position is indicated by one of the following messages. CLOSED (valve is closed) OPEN (valve is open) REGLTG (valve is regulating)

 (b)  
For invalid valve position data, the message is removed.

 (10)
 Manifold Duct Pressure

 (a)  Displayed in units of psi.

 (11)
 Cabin Altitude

 (a)  Displayed in units of feet.

 (12)
 Cabin Rate

 (a)  Displayed in units of feet per minute.

 (13)
 Cabin Differential Pressure

 (a)  Displayed in units of psi.

 (14)
 Landing Altitude

 (a)  Displayed in units of feet, with control mode annunciations of MAN (manual) or AUTO (automatic).

 (15)
 CPC In Control

 (a)  
The Cabin Pressure Channel (CPC) in control is annunciated by an A (CPC A in control) or B (CPC B in control).

 (b)  
The annunciation will be blanked for a no channel in control condition.

 (16)
 Outflow Valves

 (a)  Left and right outflow valve position is indicated by scaled digital readouts with control mode annunciations. Full open is indicated by 1.00 and full closed by 0.00. The control modes will be annunciated by MAN (manual) or AUTO (automatic).

 (17)
 Freighters
 Forward Cargo Overboard Valve Position

 (a)  
The forward cargo outboard valve position is indicated by scaled digital readouts. Full open is indicated by 1.00 and full closed by 0.00.

 Forward Cargo Overboard Backup Valve Position

 (b)  
The forward cargo outboard back up valve position is indicated by a text message, OPEN or CLOSED.

 F. EICAS Electrical Maintenance Display (Fig. 53)
 (1)  
General

 (a)  
Electrical parameters for ac volts, frequency, ac load, dc volts, dc amps and the IDG outlet and rise temperatures are presented for display.

 (b)  
All electrical information is received by the EIU on an ARINC 429 data bus from the Bus Control Unit.

 (2)  
AC Volts

 (a)  AC voltages for generators 1 thru 4, APU generators 1 and 2, and external power inputs 1 and 2 are displayed in units of volts.

 (3)  
Frequency

 (a)  Frequency for generators 1 thru 4, APU generators 1 and 2, and external power inputs 1 and 2 is displayed in units of hertz.
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