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 (p) Pitch Altitude Hold Mode 1) The pitch altitude hold mode is manually requested by pressing the HOLD switch/light on the MCP. A valid request is indicated by the lighting of the dot-bar matrix on the lower half of the switch cover. The altitude hold mode is automatically selected when in the vertical speed mode and V/S is zero. (The V/S light will remain lighted.)
 2)  The altitude hold mode is also selected automatically when in the VNAV mode and the FMC has commanded a target altitude in a direction away from the MCP selected altitude. Under these conditions, VNAV disengages and the VNAV switch/light extinguishes. Pitch altitude hold is active in CMD ENG or F/D on.
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SELECTED VERTICAL
SELECTED  SELECTOR ALTITUDE
AUTOPILOT LEFT, CENTER, RIGHT ENGAGE SWITCH
ALTITUDE SPEED DISPLAY
COMMAND ENGAGE (CMD) SWITCH/LIGHT
CAPTAIN'SFLIGHT

FIRST
DIRECTOR
OFFICER'S
ON/OFFSWITCH FLIGHTDIRECTORON/OFFSWITCH ALTITUDE HOLD VERTICAL SPEED

 

VERTICAL SPEED MODE SELECT SWITCH/LIGHT
MODE SELECT
SELECT KNOB
SWITCH/LIGHT  SELECT SWITCH/LIGHT
A
757
MAINTENANCE MANUAL

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(+1,500 FT/MIN)
1 . ALTITUDE SELECT DISPLAY MANUALLY 3 . V/S SWITCH PUSHED FOR V/S ENGSET FOR ATC CLEARANCE OF 15,000 FT- ALT HOLD DOT-BAR EXTINGUISHES. V/S SWITCH PUSHED FOR V/S ENG- V/S DOT-BAR ILLUMINATES
V/S DOT-BAR ILLUMINATES -- VERT SPD DISPLAY INDICATES 0
. VERT SPD DISPLAY SET FOR +1,500 FT/MIN . VERT SPD DISPLAY FOR +1500 FT/MIN

A/P CLIMBS TO POINT 2 IN V/S MODE  -- A/P CLIMBS TO POINT 4 IN V/S MODE
2 . ALT HOLD SWITCH PUSHED (AT 10,000 FT)  4 . VERT SPD DISPLAY SET TO 0 AT SELECTED POINT
V/S DOT-BAR EXTINGUISHES  
-- A/P LEVELS & HOLDS BAROMETRIC ALTITUDE

V/S DISPLAY BLANKS  
-- UNDER ALT HOLD LOGIC CONTROL

ALT HOLD DOT-BAR ILLUMINATES  -- V/S MODE ARMED
A/P LEVELS TO BAROMETRIC ALTITUDE AT TIME  -- FMA ON EADI IN PITCH MODE ENGAGED
0F ALT HOLD SELECTEDSECTION INDICATES V/S

AFDS UNDER ALT HOLD LOGIC CONTROL
-

FMA ON EADI IN PITCH MODE ENGAGED
-

GUN 001-050,052-999

GUN 051
SECTION INDICATES ALT HOLD
Pitch Channel - Altitude Select/Hold Mode
Figure 12

5 . VERT SPD DISPLAY SET FOR +1500 FT/MIN
V/S MODE ENGAGED
-

V/S DOT-BAR ILLUMINATES
-

A/P CLIMBS TO POINT 6 IN V/S MODE -
6 . CRITERIA SATISFIED FOR ALT CAPTURE
V/S DOT-BAR EXTINGUISHES -
HOLD DOT-BAR ILLUMINATES
-

FMA ON EADI INDICATES ALT CAP UNTIL <10 FT
-FROM SELECTED ALT, THEN INDICATES ALT HOLD

A/P LEVELS OFF TO 15,000 FT -
AFDS UNDER ALT SELECT LOGIC CONTROL -
D01146
A

757
MAINTENANCE MANUAL

 (q) Pitch Altitude Select Mode
 1)  Altitude select arm and altitude select engage are not manually selectable on the MCP. Altitude select occurs at altitude capture, which is determined by capture criteria, and may be entered from any of the following modes: V/S, FLCH, VNAV, T/O (in F/D only), and GA. Altitude select may not be entered from the G/S mode.
 (11) Altitude Select/Hold Control Logic (Fig. 10)
 (a)
Flare Engage Logic

 1)  Flare engage logic is generated by computation of the appropriate data from the data management bus.

 (b)
Vertical Position Approach Logic

 1)  The vertical position approach logic is generated from flare engage or glideslope engage. This logic is required for switching between flare engage/glideslope engage circuitry and ALT HOLD/SELECT circuitry.

 (c)
Vertical Position Engage Logic

 1)  Vertical position engage logic is generated by either flare engage, glideslope engage, altitude select engage and altitude hold engage and generates vertical position engage. Whenever a vertical position mode change occurs, vertical position engage is momentarily interrupted. The vertical position engage logic is required for switching from a synchronization mode to active flare engage, glideslope engage, altitude select engage, and altitude hold engage mode in the vertical position command processor.
　
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