is wet from rain or deicing/anti-icing fluid.
Station personnel will be responsible for providing a means to access the upper wing surface in order to complete the (hands-on) check.
LEFT WING LOOKING DOWN
LOCATION OF TUFT AND TRIANGLE
DECAL ASSEMBLIES
ACCESS DOORFRONT SPAR
ACCESS DOOR
REAR SPAR DOUBLER
TUFT AND TRIANGLE DECAL ASSEMBLY
MD804002
TUFT AND TRIANGLE DECAL
PAINTED ICE DETECTION TRIANGLE
MD804001
PAINTED ICE DETECTION TRIANGLE
Aircraft With An Operational Upper Wing Anti-Ice (UWAI) System
Flight Crew Procedures
Press to test the WING ICE ALERT and WING HTR INOP lights to ensure the bulbs are working. Then confirm that the WING ICE ALERT and WING HTR INOP lights are extinguished prior to departure from the gate or parking area. A physical check of the upper wing surfaces is not required. The Aircraft Maintenance Logbook box 24 “MD-80 Clear Ice Check Accomplished” entry is not required.
Caution: All annunciation of the WING ICE ALERT and WING HTR INOP lights is suppressed when the throttles are advanced to the takeoff position. When performing the check of these lights, ensure the throttles are in the closed position.
If the WING ICE ALERT and/or the WING HTR INOP lights are on prior to departure, from the gate or parking area, a physical check of the upper wing surfaces and Aircraft Maintenance Logbook box 24 “MD-80 Clear Ice Check Accomplished” entry are required as described previously in Aircraft Without An Operational Upper Wing Anti-Ice System. This check should be accomplished 15 minutes prior to departure to avoid delays.
Caution: During cold months, electrical power should be connected to the aircraft continuously overnight to power the UWAI System. If power has not been connected at least 3 hours prior to flight, there is a potential that an ice buildup (in the protected areas) may not be completely removed by the UWAI System prior to departure. Prior to the FFOD, when ambient temperature during preflight is below 50° F, Flight Crews should exercise special vigilance to verify proper operation of the UWAI System and that no ice is on the upper surface of the wings.
Note: Precipitation may run off a warm overwing heater and refreeze elsewhere on the wing. Flight crews should carefully examine the areas immediately aft of the overwing heaters for ice formation during walk around.
Note: An operational UWAI system does not affect required procedures listed in COLD WEATHER OPERATIONS, this section.
UWAI System Description
Two amber lights on the upper instrument panel (to the left of the ASSUMED TEMP selector) indicate the status of the UWAI system:
WING ICE Indicates the temperature in one or more sensors has fallen
ALERT below 38.F and there is the possibility of ice formation.
WING HTR Indicates failure of a heater segment or internal controller
INOP failure. The UWAI system is inoperative.
The UWAI system is a very thin electric heater blanket assembly which is bonded to the upper wing surface over the affected area (cold corner). The UWAI system electrically heats the blanket assemblies in essentially the same manner as windshield heat. Temperature sensors embedded in the heater blanket assemblies send upper wing temperature signals to their respective controller unit. The left & right wing controller units (mounted in the fuselage just forward of the slat drive mechanism), regulate electrical power to the heater blanket assemblies to maintain upper wing surface temperature above freezing. The UWAI system does not require any input or control from the flight crew to function.
Electrical bus protection for the UWAI main power circuits is through the #3 galley 35 AMP three phase circuit breakers located on the right generator bus circuit breaker panel, labeled #3 GALLEY POWER AND UPPERWING ANTI-ICE. Electrical bus protection for the UWAI control circuits is through a 1 AMP circuit breaker located at H-26, labeled UPPER WING ANTI-ICE. Three phase power that is normally routed to galleys #2 & #3, is now routed through an air/ground sense relay. When the aircraft is on the ground, electrical power is removed from galleys #2 & #3 and is applied to the UWAI system. When the aircraft is airborne, electrical power is completely removed from the UWAI system and electrical power to galleys #2 & #3 is restored. During AC crosstie operation, UWAI power along with galley power will load shed automatically. This is done so that aircraft electrical bus limitations are not exceeded. Pulling the 1 AMP UWAI control circuit breaker, (H-26) labeled UPPER WING ANTI-ICE, will remove all power to the UWAI system and will restore power to galleys #2 & #3. Galley power switch position has no effect on UWAI operation.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：MD-80 Flight Manual 麦道80飞行手册 2(52)
