(f)
Four display areas are allocated to accommodate the four most recent profiles (start and/or operational profiles). The first profile is displayed in the left-most position (column for engine No. 1). With each subsequent profile, the older profiles are shifted to the right and the newest profile is displayed in the left-most position. Thus, if four profiles are being displayed, the newest profile is in the column for engine No. 1 (left-most column), and the oldest profile is in the column for engine No. 4 (right-most column). For the fifth and subsequent exceedances, the profiles being displayed are shifted one profile position to the right to accommodate the new profile. The oldest profile (column for engine No. 4) is overwritten when the profiles are shifted to the right.
L. EICAS EPCS Maintenance Display (Fig. 59)
(1)
General
(a)
Electronic Propulsion Control System (EPCS) parameters for thrust lever resolver angle, stator vane actuator, bleed valve actuator, corrected N2, inlet temperature, static pressure, total pressure, thrust reverser position, differential oil temperature, exhaust gas pressure, air/oil cooler and turbine case cooling are presented for display.
(b)
All of the parameters are received by the EIU on an ARINC 429 data bus from the EPCS.
(2)
Channel In Control
(a) An A or B is displayed above the readouts to indicate the selected EPCS channel. A white colored box is displayed around the A or B caption to indicate the controlling channel. If the controlling channel becomes invalid, the box is removed.
(3)
Thrust Lever Resolver Angle (TRA)
(a) Displayed in units of degrees of displacement. The display range is from 5 to 85 degrees with full forward thrust at 85 degrees, idle at 35 degrees and full reverse thrust at 5 degrees.
(4)
Stator Vane Position (SVA)
(a) Displayed in units of percent open, including sign. When the readout indicates zero or greater, the sign is blanked.
(5)
Bleed Valve Actuator (BVA)
(a) Displayed in units of percent open, including sign. When the readout indicates zero or greater, the sign will blank.
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MAINTENANCE MANUAL
CHANNEL IN THRUST LEVER CONTROL
RESOLVER ANGLE STATOR VANE
BLEED VALVE POSITION
ACTUATOR
CORRECTED N2 TEMPERATURE STATIC PRESSURE
INLET TOTAL
TOTAL PRESSURE
THRUST REVERSER DELTA
POSITION OIL TEMPERATURE
LVDT
EXHAUSTED COOLER AIR/OIL GAS PRESSURE
TURBINE CASE COOLING
EICAS EPCS Maintenance Display
Figure 59
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MAINTENANCE MANUAL
(6)
Corrected N2 (N2C)
(a) Corrected N2 (N2 corrected for temperature at the local altitude) is displayed in units of percent rpm.
(7)
Inlet Total Temperature (T2)
(a) Displayed in units of °C (Celsius), including sign. When the readout indicates zero or greater, the sign is blanked.
(8)
Static Pressure (PS)
(a) Displayed in units of psi ambient.
(9)
Total Pressure (P2)
(a) Displayed in units of psi ambient.
(10)
Thrust Reverser Position LVDT (RP)
(a) Displayed in units of percent of displacement, including sign. When the readout indicates zero or greater, the sign is blanked.
(11)
Delta Oil Temperature (DOT)/(SCAV)
(a) Differential oil temperature for the No. 3 bearing is displayed in units of °C (Celsius).
(12)
Exhaust Gas Pressure (P5)
(a) Displayed in units of psi ambient.
(13)
Air/Oil Cooler (AOC)
(a) Displayed in units of percent open, including sign. When the readout indicates zero or greater, the sign is blanked. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 指示/记录系统 2(94)
