(b)
Exit from V/S to control inactive requires switching A/P and F/D to off. Exit to FLCH, ALT HOLD and G/A modes requires that the mode switch/light be pressed and the request accepted. Vertical speed is active during VNAV ARM and G/S ARM conditions. Exit to VNAV capture requires that VNAV arm is established which includes VNAV switch/light pressed and accepted, no ILS modes are established, and the airplane is within the capture zone. Exit to glideslope capture requires that the APP switch/light is pressed and accepted and that the airplane is within the glidelsope capture zone.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
22-12-00
ALL ú ú 14 Page 30 ú Dec 20/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
EADI
AFDS MCP
á COMMAND ENGAGE (CMD ENG)
. AIRPLANE
ì VERTICAL SPEED (V/S) MODE
ì CLIMBOUT AT PRESENT V/S DISPLAYED
ì V/S MAY BE CHANGED WITH V/S KNOB
. MCP ì A/P CMD SWITCH ENGAGED ì ALT DISPLAY SET AT ATC CLEARED ALTITUDE ì VERTICAL SPEED DISPLAY SYNC TO V/S AT ENGAGEMENT, THEN CHANGED AS DESIRED
ì V/S SWITCH DOT-BAR MATRIX ILLUMINATED
. EADI ì F/D BARS INDICATE AIRPLANE AT COMMANDED PITCH ATTITUDE IF F/D SWITCH ON. ì FMA INDICATES:
ì STATUS-CMD
ì PITCH MODE ENGAGED-V/S
Pitch Channel - Vertical Speed Mode
Figure 11 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. GUN 001-050, 052-999 ú
22-12-00
ú ú 14 Page 31 ú Dec 20/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
D01114
A
757
MAINTENANCE MANUAL
AFDS MCP
EADI
á COMMAND ENGAGE (CMD ENG)
. AIRPLANE
ì VERTICAL SPEED (V/S) MODE
ì CLIMBOUT AT PRESENT V/S DISPLAYED
ì V/S MAY BE CHANGED WITH V/S KNOB
. MCP
ì A/P CMD SWITCH ENGAGED
ì ALT DISPLAY SET AT ATC CLEARED ALTITUDE
ì VERTICAL SPEED DISPLAY SYNC TO V/S AT ENGAGEMENT, THEN CHANGED AS DESIRED
ì V/S SWITCH DOT-BAR MATRIX ILLUMINATED
. EADI
ì F/D CUE INDICATES AIRPLANE AT COMMANDED PITCH ATTITUDE IF F/D SWITCH IS ON.
(F/D MUST BE SELECTED TO CHANNEL OTHER THAN THE CMD A/P ENGAGE CHANNEL TO DISPLAY F/D CUE).
ì FMA INDICATES:
ì STATUS-CMD
ì PITCH MODE ENGAGED-V/S
Pitch Channel - Vertical Speed Mode
Figure 11 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. GUN 051 ú
22-12-00
ú ú 12 Page 32 ú Dec 20/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C71007
A
(c)
(d)
(e)
(f)
(g)
(h)
757 MAINTENANCE MANUAL
Two submodes are available: VNAV ARM and G/S ARM. The airplane is controlled with V/S until reaching the capture zone of VNAV or G/S. After capture, V/S control is stopped and VNAV or G/S signals provide pitch commands. VNAV and G/S armed are annunciated on the EADI.A valid V/S mode switch request is required for acceptance into V/S mode. However, entry into V/S is automatic without pressing a V/S switch/light when an F/D or A/P is engaged from control inactive, and an autothrottle SPD or EPR mode is engaged.With V/S engaged, the airplane holds the existing V/S if within |30 degrees pitch angle. If greater than 30 degrees, the airplane attitude is reduced to 30 degrees and the corresponding vertical speed is used as the reference. The EADI flight mode annunciator displays V/S when the V/S pitch mode is engaged.Vertical Speed Command Processing 1) Vertical speed command processing computes the pitch path
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本文链接地址：757 AMM 飞机维护手册 自动飞行 AUTOFLIGHT 1(126)
