LG POSITION INDICATING AND WARNING SYSTEM -INDICATIONS -MULTI-FUNCTION DISPLAY
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
TAIL STRIKE SYSTEM -INTRODUCTION
Purpose
The tail strike system supplies tail strike indication to the flight deck if a tail strike occurs.
Tail Strike Assembly
The tail strike assembly (TSA) is a blade antenna shaped device. There are two wires in the assembly which are near the outside surface of the TSA.
The TSA is in the airplane tail strike area on the bottom of the aft fuselage.
Interface
The two wires in the TSA make inputs to the two proximity sensor electronics units (PSEUs). The PSEUs supply tail strike data to the AIMS for flight deck display.
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777 AIRCRAFT MAINTENANCE MANUAL
TAIL STRIKE SYSTEM -INTRODUCTION
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TAIL STRIKE SYSTEM -FUNCTIONAL DESCRIPTION
General
The two wires in the TSA are on separate channels. Both wires get 28v dc power. One wire gets electrical power from the primary power circuit breaker that also supplies primary power to PSEU 1. PSEU 1 monitors this wire. The other wire gets electrical power from the circuit breaker that also supplies primary power to PSEU 2. PSEU 2 monitors this wire. Both channels are normally closed circuits.
Detection
If a tail strike occurs, the TSA contacts the ground and becomes damaged or breaks off the airplane. This damages both wires and causes both PSEUs to get open/short circuit inputs.
Indication
If both PSEUs get open/short circuit inputs, a TAIL STRIKE caution message shows.
The landing Gear actuation/indication maintenance page shows the status of the inputs from the tail strike system.
Training Information Point
If there is a failure (open/short circuit) in a single channel, the TAIL STRIKE CHAN 1 or TAIL STRIKE CHAN 2 status message shows.
Both of these messages also show if there is a tail strike.
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
TAIL STRIKE SYSTEM -FUNCTIONAL DESCRIPTION
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