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Diamond Aircraft DA 20-C1 Service Bulletin
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Diamond Aircraft DA 20-C1 Service Bulletin

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Diamond Aircraft Industries
OPTIONAL SERVICE BULLETIN
Model DA 20-C1
OPTIONAL SERVICE BULLETIN NO. DAC1-61-01 REV. 5
I
TECHNICAL DETAILS
I.1
Category
Recommended.
I.2
Airplanes Affected
Type:
Serial Numbers:
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.
DAC1-61-01 Rev. 5
Page 1 of 9
29 November 2019
SUPERSEDES DAC1-61-01 REV. 4
DA 20-C1
C0001 up to and including C0192
© DAI 2019 ALL RIGHTS RESERVED, PROPRIETARY DOCUMENT
Internet: www.diamondair.com
Email:
Techpubs@diamondair.com

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Summary of Contents for Diamond Aircraft DA 20-C1

  • Page 1 Diamond Aircraft Industries OPTIONAL SERVICE BULLETIN Model DA 20-C1 OPTIONAL SERVICE BULLETIN NO. DAC1-61-01 REV. 5 SUPERSEDES DAC1-61-01 REV. 4 TECHNICAL DETAILS Category Recommended. Airplanes Affected Type: DA 20-C1 Serial Numbers: C0001 up to and including C0192 Time of Compliance At owner’s discretion.
  • Page 2 Diamond Aircraft Industries OPTIONAL SERVICE BULLETIN Model DA 20-C1 Figure 1. Original configuration, Sensenich W69EK-63, 3/8” diameter attachment bolts. DAC1-61-01 Rev. 5 © DAI 2019 ALL RIGHTS RESERVED, PROPRIETARY DOCUMENT Internet: www.diamondair.com Page 2 of 9 Email: Techpubs@diamondair.com 29 November 2019...
  • Page 3 Diamond Aircraft Industries OPTIONAL SERVICE BULLETIN Model DA 20-C1 Figure 2. Recommended configuration, Sensenich W69EK-63, W69EK-63G, or W69EK7-63GM, 7/16” diameter attachment bolts. NOTE: the installation and maintenance procedures for the W69EK7-63G and W69EK7-63GM propellers are the same as those for the W69EK7-63 propeller.
  • Page 4 Diamond Aircraft Industries OPTIONAL SERVICE BULLETIN Model DA 20-C1 Accomplishments/Instructions PART I - Installation of W69EK7-63, W69EK7-63G, or W69EK7-63GM Propeller: 1. Remove the engine cowlings. 2. Remove the W69EK-63 propeller as per AMM Chapter 61. 3. Remove the six bushings in the propeller flange using the removal/installation tool as shown in Figure 3.
  • Page 5 Diamond Aircraft Industries OPTIONAL SERVICE BULLETIN Model DA 20-C1 Figure 3. Instructions for step 6. DAC1-61-01 Rev. 5 © DAI 2019 ALL RIGHTS RESERVED, PROPRIETARY DOCUMENT Internet: www.diamondair.com Page 5 of 9 Email: Techpubs@diamondair.com 29 November 2019...
  • Page 6 Diamond Aircraft Industries OPTIONAL SERVICE BULLETIN Model DA 20-C1 PART II - Replacement of Castellated Nuts 12. Remove the engine cowlings. 13. Remove cotter pins. 14. Remove AN310-7 nuts and washers. 15. Ensure that bolt threads are clean and free from burrs.

  • Page 7: Planning Information

    NOTE: the AN7-47A bolts supplied in the materials kit may be replaced with the 22-6103-00-03 extended thread bolts. The 22-6103-00-03 extended thread bolts are identified by the D, A, and X markings on the head. Contact Diamond Aircraft Parts Department for these bolts. Retaining compound...
  • Page 8 To obtain satisfactory results, procedures specified in this service bulletin must be accomplished in accordance with accepted methods and current government regulations. Diamond Aircraft cannot be responsible for the quality of work performed in accomplishing the requirements of this service bulletin. Diamond Aircraft reserves the right to void continued warranty coverage in the area affected by this service bulletin if it is not incorporated.
  • Page 9 Diamond Aircraft Industries OPTIONAL SERVICE BULLETIN Model DA 20-C1 EXECUTION REPORT TO SERVICE BULLETIN DAC1-61-01 REV. 5 AIRPLANE INFORMATION Airplane Serial Number ____________________ Airplane Registration ____________________ Airplane Operator ____________________ Hours of Operation of Airplane ____________________ No. of Landings ____________________ Hours of Operation of Engine...