STC SA12533IB

42, 7e Rue Val-d'Or, Quebec Canada J9P 0G6 Part 23 Title 14, Code of Federal Regulations A-806 De Havilland Aircraft of Canada Limited DHC-2 Mk. I

1. If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission.

2. The installer must determine whether this design change is compatible with previously approved modifications.

(See Continuation Sheet 3) 01/13/2026 11/06/2026 Timothy Hadsall (Acting) Manager, International Validation Branch Compliance & Airworthiness Division Aircraft Certification Service 6

1. Installation of P&W PT6A-34 Turbine & Hartzell HC-B3TN-3DY/T10282+4 Propeller in accordance with Aero-Entretien Q-60 Inc. Modification Summary No: AVD-31101-MS-0001, Revision 4, dated August 12, 2026, or later Transport Canada Civil Aviation (TCCA) approved revision.

2. Operation must be in accordance with Aero-Entretien Q-60 Inc. Flight Manual Supplement No: AVD-31101-FMS-0001, Revision B, dated April 25, 2026, or later TCCA approved revision.

3. Maintenance must be in accordance with Aero-Entretien Q-60 Inc. Instructions for Continued Airworthiness No: ICA-BW64000, Revision C, dated August 4, 2026, or later TCCA accepted revision.

3. This STC is applicable to all serial numbers for this Make-Model.

4. Operation must be in accordance with the Limitations section of the Flight Manual Supplement identified in the Description of Type Design Change section of this STC.

5. Maintenance must be in accordance with the Airworthiness Limitations section of the Instructions for Continued Airworthiness identified in the Description of Type Design Change section of this STC, TCCA approved August 7, 2026, or later TCCA approved revision.

6. The aircraft must have the following approved modifications installed prior to or in conjunction with this STC:

FAA STC SA610GL: Install Wipaire Model 6000 seaplane or amphibious floats or Model 6100 seaplane or amphibious floats FAA STC SA00094NY: Installation of cabin extension kit FAA STC SA00857NY: Installation of a new Advanced Wing Technologies (AWT) wing and increase in gross weight to 6000 pounds FAA STC SA02135SE: Installation of Electronics International Inc. Glass Panel Engine Monitor (with In-Flight Data) FAA STC SA01645NY: Installation of Sealand Front Fuselage Strut Assembly, part number SAL 9000 per Installation Instruction for SAL-9000 Front Strut Assembly

Limitation #6 continued:

FAA STC SA00962NY: Installation of Wipline 6100 Floats FAA STC SA02340AK: Manufacture tailplane reinforcement brackets FAA STC SA02258AK: Fabrication and installation of a replacement forward fuselage tubular frame Mod Change C2CF3331A: OEM Brake master cylinder for DHC-2 Mk. I aircraft

Certification Basis:

Based on Title 14 Code of Federal Regulations (14 CFR) § 21.115 and § 21.101, and the FAA policy for design changes that are identified as significant in FAA Order 8110.48, the type certification basis for modified De Havilland DHC-2 Mk. I is as follows:

a. The type certification basis for the De Havilland DHC-2 Mk. I is shown on Type Certificate Data Sheet (TCDS) A-806 for parts not changed or not affected by the change.

b. The type certification basis for the De Havilland DHC-2 Mk. I for parts changed or affected by the change is as follows:

14 CFR Part 23 Regulations as amended by amendment 23-0 through 23-63:

23.1, 23.2, 23.3, 23.21, 23.23, 23.25, 23.29, 23.31, 23.33, 23.45, 23.49, 23.51, 23.53,

23.63, 23.65, 23.69, 23.71, 23.73, 23.75, 23.77, 23.141, 23.143, 23.145, 23.147, 23.149,

23.151, 23.153, 23.155, 23.157, 23.161, 23.171, 23.173, 23.175, 23.177, 23.179, 23.181,

23.201, 23.203, 23.207, 23.231, 23.233, 23.237, 23.239, 23.251, 23.253, 23.301, 23.303,

23.305, 23.307, 23.321, 23.331, 23.333, 23.335, 23.337, 23.341, 23.343, 23.345, 23.347,

23.349, 23.351, 23.361, 23.363, 23.371, 23.391, 23.393, 23.395, 23.397, 23.399, 23.405,

14 CFR Part 23 Regulations as amended by amendment 23-0 through 23-63:

23.407, 23.409, 23.415, 23.421, 23.423, 23.425, 23.427, 23.441, 23.443, 23.445, 23.455,

23.691, 23.697, 23.735, 23.771, 23.773, 23.777, 23.779, 23.781, 23.831, 23.853, 23.863,

23.865, 23.867, 23.871, 23.901, 23.903, 23.905, 23.907, 23.925, 23.929, 23.933, 23.937,

23.939, 23.943, 23.951, 23.954, 23.955, 23.957, 23.959, 23.961, 23.963, 23.965, 23.967,

23.969, 23.971, 23.973, 23.975, 23.977, 23.991, 23.993, 23.994, 23.995, 23.997, 23.999,

23.1011, 23.1013, 23.1015, 23.1017, 23.1019, 23.1021, 23.1023, 23.1027, 23.1041,

23.1043, 23.1045, 23.1091, 23.1093, 23.1103, 23.1105, 23.1111, 23.1121, 23.1123,

23.1141, 23.1143, 23.1145, 23.1149, 23.1153, 23.1155, 23.1163, 23.1165, 23.1181,

23.1182, 23.1183, 23.1189, 23.1191, 23.1193, 23.1303, 23.1305, 23.1307, 23.1310,

23.1311, 23.1321, 23.1322, 23.1325, 23.1327, 23.1331, 23.1337, 23.1353, 23.1357,

23.1359, 23.1361, 23.1365, 23.1367, 23.1501, 23.1505, 23.1507, 23.1519, 23.1521,

23.1523, 23.1525, 23.1527, 23.1529, 23.1541, 23.1543, 23.1545, 23.1549, 23.1551,

23.1553, 23.1555, 23.1557, 23.1559, 23.1563, 23.1567, 23.1581, 23.1583, 23.1585,

23.1587, 23.1589

14 CFR Part 23 Regulations at an intermediate amendment:

Regulation Amendment

23.1301 23-20

23.1309 23-49

23.1323 23-49

23.1351 23-34

23.1431 23-49

CAR Part 3 Regulations:

Regulation Effective Date

3.124 May 15, 1956 (See Continuation Sheet 6) 5 6

14 CFR Part 34 Amendment 34-7 14 CFR Part 36 Amendment 36-32

Equivalent Level of Safety Findings have been made for the following regulation(s):

23.45 Flight – General - Performance

23.51 Takeoff speeds

23.63 Climb: General

23.67 Climb: One engine inoperative

23.73 Reference landing approach speed

23.77 Balked landing

23.161 Trim

23.181 Dynamic Stability

23.221 Spinning

23.251 Vibration and Buffeting

23.253 High Speed Characteristics

23.571 Metallic pressurized cabin structures

23.785 Seats, berths, litters, safety belts, and shoulder harness

23.831 Ventilation

23.1195 Fire extinguishing systems

23.1197 Fire extinguishing agents

23.1199 Fire extinguishing containers

23.1201 Fire extinguishing materials

23.1527 Maximum operating altitude

23.1445 Oxygen distribution system

23.1545 Airspeed Indicator

23.1583 Operating Limitations (documented in P&S ELOS Memorandum ST20907IB-A-23-62) Note: Some of above ELOS regulations were not affected by the type design change.

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