SDR 99ZZZX1037

Service difficulty report · Switch · Beech A36

Difficulty date
January 17, 1999
Submitted
March 26, 2000
Operation
General aviation
Aircraft
N705MB
Make and model
Beech A36
Aircraft serial
E2836
Part
Switch
Part number
BZ3AT
Condition
Inoperative
Location
Flaps
Part time
506 hours
Stage of operation
IN
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

THE 14 DEGREE APPROACH LIMIT SWITCH FAILED ALLOWING THE MOTOR TO BE OVERWORKED, RUINING THE CABLES AND BURNING THE CIRCUITRY ON THE PCB RELAY ASSEMBLY. THE REPLACEMENT MOTOR WAS DEFECTIVE AND FRIED THE NEW PCB BOARD. THIS OCCURS WITHOUT BLOWING THE MOTOR BREAKER. SUBMITTER RECOMMENDED A WIRING MODIFICATION BE PURSUED THAT WILL NOT ALLOW FAILURE OF THE 14 DEGREE LIMIT SWITCH TO BYPASS THE DOWN LIMIT SWITCH AND DAMAGE THE SYSTEM AND/OR A TAG THAT COMES WITH A NEW FLAP MOTOR THAT GIVES ELEC CAPABILITY OF MOTOR AND WARNS OF A MOTOR PULLING TOO MUCH AMPERAGE MAY WEAKEN OR BURN THE MOTOR CIRCUITRY ON THE PCB. FAILURE OF THESE COMPONENTS MAY NOT ALLOW PILOT TO RETRACT FLAPS IN-FLIGHT, ETC.

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