Beech 18 "A Civil &
Military History" By Robert K Parmerter
VOLUME 1
May 1, 1948
NUMBER 8
MODEL 18 SERVICE NOTES AND
CHANGES
Elevator Tab Rheostat Modification
An improved elevator tab
rheostat drive has been incorporated in Model D18 airplanes in production.
This change was effective on D18S Serial A-402 and D18C Serial AA-27. Model
D18 airplanes delivered prior to A-402 and AA-27 may be modified in
accordance with the following instructions at the option of the customer.
Remove the rheostat from the elevator and cut off the shaft to 17/32-inch
from the threaded section of the rheostat.
File a flat spot on the shaft 7/16-inch from the end of the shaft.
Install the new pinion, part No. 404-186112, on the rheostat shaft and
reinstall the rheostat in the elevator.
Install the bracket, rack, and spring assembly on the elevator tab
actuator.
NOTE: It may be necessary to make a cutout in the fabric to make this
installation.
Calibrate the rheostat to the elevator tab indicator.
The
following parts are required to perform this modification:
1
each 404-186112 pinion
assembly
1
each AN500-A6-3 screw
3
each AN960-A616
washer
1
each AN392-19 pin
1
each AN960-4 washer
1
each 404-186113 rack
assembly
1
each 404-186114 spring
2
each AN515-10-4 screw
2
each AN365-1032 nut
2
each AN960-10 washer
1
each 404-186111 bracket
assembly
Copyright Southwestern Aero Exchange, 2004 - All Rights
Reserved.
Southwestern Aero Exchange
18502 E. 108th St. N.
Owasso, OK 74055
phone: 918-272-9815 / fax: 918-272-4375
