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Diamond Aircraft Industries
OPTIONAL SERVICE BULLETIN
Model DA 20-C1
DAC1-61-01 Rev. 5
Page 1 of 9
29 November 2019
OPTIONAL SERVICE BULLETIN NO. DAC1-61-01 REV. 5
SUPERSEDES DAC1-61-01 REV. 4
I TECHNICAL DETAILS
I.1 Category
Recommended.
I.2 Airplanes Affected
Type: DA 20-C1
Serial Numbers: C0001 up to and including C0192
I.3 Time of Compliance
At owner’s discretion.
I.4 Subject
ATA code: 61-00.
I.5 Reason
This service bulletin addresses the Sensenich propeller installation.
This revision adds the use of special extended thread 7/16” attachment bolts (P/N 22-6103-00-03) as
an alternative to the AN7-47A bolts. These extended thread bolts do not require AN960-716 or
AN960-716L shim washers to ensure proper thread engagement. The extended thread bolts are
identified by the “D, A and X” letters on the head. A Part III has been added to this bulletin to provide
the procedure for replacing the AN7-47A bolts with the extended thread bolts.
PART I – Describes the procedure for the replacement of propellers with 3/8” attachment bolts with a
propeller that uses 7/16” diameter attachment bolts (AN7-47A or 22-6103-00-03). This installation
increases the clamping force of the propeller and allows torque inspection without the removal of the
forward spinner dome.
PART II – Describes the replacement of castellated nuts and cotter pins, as fitted to some aircraft,
with self-locking nuts. The installation of self-locking nuts makes torque inspection easier.
PART III – Describes the procedure for the replacement of AN7-47A attachment bolts with the 22-
6103-00-03 extended thread bolts.
I.6 Approval
Engineering data referenced or contained in this service bulletin is approved as part of the type
design.
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