EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-51-00
ALL ú ú 04 Page 31 ú Jun 20/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
~.......................................
| TABLE FOR FSEU BITE CHECK OF T.E. AND |
| L.E. LIGHTS AND EICAS MESSAGES |
.........................................
| FSEU | OUTPUT |
.........................................
| NO. 1 | TE LIGHT |
| ................................
| | LE LIGHT |
| ................................
| | TE FLAP DISAGREE |
| ................................
| | TE FLAP ASYM |
| ................................
| | LE SLAT DISAGREE |
| ................................
| | LE SLAT ASYM |
| ................................
| | FLAP LOAD RELIEF |
| ................................
| | FLAP/SLAT ELEC |
.........................................
| NO. 2 | TE LIGHT |
| ................................
| | LE LIGHT *[1] |
| ................................
| | TE FLAP DISAGREE |
| ................................
| | TE FLAP ASYM |
| ................................
| | LE SLAT DISAGREE |
| ................................
| | LE SLAT ASYM |
| ................................
| | FLAP/SLAT ELEC |
.........................................
| NO. 3 | FLAP/SLAT ELEC |
2........…..............................1
*[1] LE slat alternate drive arming switch (P3) must
be armed.
(d)
The BITE test is used only during aircraft maintenance.
L.
Resolvers
(1)
Flap position information used by the FSEU is provided by
resolvers.
(2)
There are 6 resolvers in the flap system: two at the outboard end of each outboard torque tube, one on the flap power drive unit and one connected to the flap control lever.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-51-00
ALL ú ú 05 Page 32 ú Jun 20/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
M. Synchros
(1)
Flap position indicator needles in the cockpit are driven by synchros.
(2)
There are two flap system synchros, one on each of the outboard ends of the flap torque tubes.
N.
Flight Deck Interface
(1)
The controls and indicators for the high lift system are located in the cockpit. The flap control lever is located on the control stand between the pilot and co-pilot. The flap needles, EICAS display screen, amber FLAPS light, alternate drive arming switches and alternate flaps/slats position selector switch are located on the pilot's main panel, forward of the control column.
O.
Position Indicators
(1)
Flap position is indicated in the cockpit by the flap/slat position indicator. The indicator has two needles which indicate position of the left and right flaps.
(2)
The position indicator needles indicate slat position between the UP position and the 1-unit position. When flap extension is commanded and the flaps and slats start extending, the flap indicator needles move to a position between the UP and 1-unit marks. After the slats reach the sealed position the flap indicator needles follow flap movement. During retraction the indicator needles follow flap movement until the flaps reach the 1-unit position. After the flaps reach the 1-unit position the indicator needles move to a position between the UP mark and the 1-unit mark. When the flaps and slats reach the fully retracted position the needles will suddenly move to the flaps UP mark.
3. Operation (Fig. 15)
_________
A. Functional Description
(1)
Primary Function
