STC SA04701NY

IMPORT SA04701NY Thunder Bay Aviation 214 Round Blvd Thunder Bay, Ontario Canada P7E 3N9 Part 3 the Civil Air Regulations *See attached FAA Approved Model List (AML) No. SA04701NY *See attached FAA AML No. SA04701NY *See attached FAA AML No. SA04701NY

1. Replacement of Fixed Wing Control Cables must be done in accordance with Thunder Bay Aviation Ltd.

Master Drawing List (MDL) as shown on Approved Model List (AML) No. SA04701NY.

2. Maintenance for DHC-2 and DHC-3 must be done in accordance with Thunder Bay Aviation Ltd.

Instructions for Continued Airworthiness as shown on AML No. SA04701NY.

3. Maintenance for DHC-6 Series 100, 200, 300 and 400 must be done in accordance with the following table on Page 3.

(Description of Type Design Change Continued on Page 3 of 9)

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.

(Limitations and Conditions Continued on Page 4 of 9) July 21, 2021 February 1, 2022

Anthony E. Gallo Manager, International Validation Branch (AIR-730) Compliance & Airworthiness Division Aircraft Certification Service (AIR) 9

IMPORT SA04701NY SA04701NY 9

DOCUMENT / MANUAL #

DESCRIPTION / TITLE DOCUMENT HOLDER

SECTION PSM 1-6-2 Revision 7 DHC-6 TWIN OTTER SERIES 100 AND 200

MAINTENANCE MANUAL Viking Air Limited Part 1 Part 2 Part 5 PSM 1-63-2 Revision 21 DHC-6 TWIN OTTER SERIES 300

MAINTENANCE MANUAL Viking Air Limited 12-00-00 20-60-01 27-00-00 27-10-00 27-10-21 27-20-00 27-20-11 27-30-00 27-30-11 27-50-00 32-50-00 76-00-00 76-10-00 PSM 1-64-2 Revision 8 DHC-6 TWIN OTTER SERIES 400

MAINTENANCE MANUAL Viking Air Limited 12-00-00 20-60-01 27-00-00 27-10-00 27-10-21 27-20-00 27-20-11 27-30-00 27-30-11 27-50-00 32-50-00 76-00-00 76-10-00 PSM 1-6-7 Revision 20 DHC-6 TWIN OTTER

ALL SERIES

INSPECTION

REQUIREMENTS MANUAL Viking Air Limited -27 SYSTEM & ITEM

11.b.

-32 SYSTEM & ITEM

-76 SYSTEM & ITEM

PSM 1-6-11 Revision 9 DHC-6 TWIN OTTER

ALL SERIES

AIRFRAME

AIRWORTHINESS

LIMITATIONS MANUAL Viking Air Limited S/B No.

6/523 Revision 'A' DHC-6 (TWIN OTTER) SERVICE BULLETIN 6/523 Viking Air Limited S/B No.

6/453 Revision Dated February 24, 1984 DHC-6 (TWIN OTTER) SERVICE BULLETIN 6/453 Viking Air Limited IMPORT SA04701NY Date of Issuance: February 1, 2022

Description of Type Design Change (continued):

3. Maintenance for DHC-6 Series 100, 200, 300 and 400:

(Continued on Page 4 of 9) 3 9

AILERON CONTROL TB Part TB-C60F1124-1 TB-C6CF1124-3 TB-C6CF1125-1 TB-C6CF1125-3 TB-C6CF1152-1 TB-C6CF1153-3 TB-C6CF1155-3 TB-C6CF1452-1 OEM Part Number C6CF1124-1 C6CF1124-3 C6CF1125-1 C6CF1125-3 C6CF1152-1 C6CF1153-3 C6CF1155-3 C6CF1452-1 C6CW1031-1 C6CW1032-1 EO 69053-10 EO 69053-11 EO 69053-12 EO 69053-13 EO 69053-14 EO 69053-15 EO 69053-16 EO 69053-17 EO 69053-18 C6CF1512-1 C6CF1512-3* TB-C6CW1031-1 TB-C6CW1032-1 TB-EO 69053-10 TB-EO 69053-11 TB-EO 69053-12 TB-EO 69053-13 TB-EO 69053-14 TB-EO 69053-15 TB-EO 69053-16 TB-EO 69053-17 TB-EO 69053-10 TBC6CF1512-10 TBC6CF1512-30 Number Description Aileron quadrant, lower groove, left-hand forward Aileron quadrant, upper groove, right-hand forward Aileron quadrant, lower groove, left-hand rear Aileron quadrant, upper groove, right-hand rear Control column to station 150.0, right hand side Station 150.0 to aileron quadrant, right hand side Station

150.0 to aileron quadrant, left hand side Aileron quadrant, lower groove, left hand forward (Mod 6/1435) Left hand wing forward, and right hand wing rear Left hand wing rear, and right hand wing forward Control column to station 150.0, right hand side Station 150.0 to aileron quadrant, right hand side Station

150.0 to aileron quadrant, left hand side Aileron quadrant, upper groove, right-hand forward Aileron quadrant, lower groove, left-hand rear Aileron quadrant, upper groove, right-hand rear Aileron quadrant, lower groove, left-hand forward (Mod 6/1435) Left hand wing forward, and right hand wing rear Left hand wing rear, and right hand wing forward Control Column to Sta. 150.0 Left Hand Side Control Column to Sta. 150.0 Left Hand Side *Applicable to DHC-6 SERIES 300 and 400 Only IMPORT SA04701NY Date of Issuance: February 1, 2022

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

3. This STC is applicable to all serial numbers for this Make, Model and Series.

4. Compliance with service life limits specified in Viking Air Ltd. DHC-6 Twin Otter All Series Airframe Airworthiness Limitations Manual, PSM 1-6-11, Revision 9, dated April 30, 2018, TCCA approved April 30, 2018, is mandatory.

5. A copy of this certificate and the FAA Approved Model List (AML) No. SA04701NY, issued February 1, 2022, must be maintained as part of the permanent records for the modified aircraft.

6. The Eligibility Lists for DHC-6 Series 100, 200, 300 and 400 are as follows:

(Continued on Page 5 of 9) 4 9

ELEVATOR CONTROL OEM Part Number TB Part Number Description C6CF1146-1 TB-C6CF1146-1 Front of elevator lever to station 426.75 C6CF1147-1 TB-C6CF1147-1 Rear of elevator lever to station 426.75 C6CF1148-1 TB-C6CF1148-1 Upper cable, station 426.75 to elevator quadrant C6CF1149-1 TB-C6CF1149-1 Upper cable, station 426.75 to elevator quadrant C6CF1100-11 TB-C6CF1100-11 Elevator lever stop cable TB-EO 69053-1 Front of elevator lever to station 426.75 TB-EO 69053-2 Rear of elevator lever to station 426.75 TB-EO 69053-3 Upper cable, station 426.75 to elevator quadrant TB-EO 69053-4 Upper cable, station 426.75 to elevator quadrant EO 69053-1 EO 69053-2 EO 69053-3 EO 69053-4 EO 69053-5 TB-EO 69053-5 Elevator lever stop cable

ELEVATOR CONTROL CABLE COMPONENTS Description Strap Strap OEM Part Number C6CF1465-29 C6CF1465-27 C3CF243-3 Fitting Arm Washer C3CF241-3 C3CF240-4 C3CF240-3 TB Part Number TB-C6CF1465-29 TB-C6CF1465-27 TB-C3CF243-3 TB- C3CF241-3 TB- C3CF240-4 TB- C3CF240-3 Stop

FLAP CONTROL OEM Part Number C6CF1038-1 C6CF1039-1 C6CF1040-1 C6CF1042-1 C6CF1122-3 C6CF1123-3 C6CF1148-1 C6CF1451-13 EO 69053-19 EO 69053-20 EO 69053-21 EO 69053-22 C6CF1513-1 C6CF1513-3* TB Part Number TB-C6CF1038-1 TB-C6CF1039-1 TB-C6CF1040-1 TB-C6CF1042-1 TB-C6CF1122-3 TB-C6CF1123-3 TB-C6CF1148-1 TB-C6CF1451-13 TB-EO 69053-19 TB-EO 69053-20 TB-EO 69053-21 TB-EO 69053-22 TBC6CF1513-1 TBC6CF1513-3 Description Flap indicator cable, forward (Pre Mods 6/1254 and 6/1404) Flap indicator cable, rear Flap selector lever to section 162.0 Flap selector lever to section 162.0 Flap selector valve follow up cable Flap selector valve upper cable Upper c able, station 426.75 to elevator quadrant Flap indicator cable, forward cable assembly (Mod 6/1404) Flap selector l ever to station 162.0 Flap selector lever to station 162.0 Flap selector valve upper cable Flap selector valve follow up cable Flap Selector V alve Lower Cable Flap Selector V alve Lower Cable *Applicable to DHC-6 SERIES 300 and 400 Only IMPORT SA04701NY Date of Issuance: February 1, 2022

Limitations & Conditions (Continued):

Eligibility Lists for DHC-6 Series 100, 200, 300 and 400 continued:

(Continued on Page 6 of 9) 5 9

NOSEWHEEL STEERING OEM Part Number TB Part Number Description C6CF1242-1 TB-C6CF1242-1 Nosewheel steering cable in control column (Pre Mod 6/1194) C6CF1242-5 TB-C6CF1242-5 Nosewheel steering cable in control column (Mod 6/1194) C6CF1251-3 TB-C6CF1251-3 Left cable to steering valve lever drum

POWER CONTROL OEM Part Number TB Part Number Description C6CE1241-3 TB-C6CE1241-3 Fuel shutoff, left wing. To front of control pulley C6CE1242-3 TB-C6CE1242-3 Fuel shutoff, left wing. To rear of control pulley C6CE1243-3 TB-C6CE1243-3 Throttle, left wing. To rear of engine control pulley C6CE1244-3 TB-C6CE1244-3 Throttle, left wing. To front of engine control pulley C6CE1245-3 TB-C6CE1245-3 Propeller pitch, left wing. To rear of propeller control pulley C6CE1246-3 TB-C6CE1246-3 Propeller pitch, left wing. To front of propeller control pulley C6CE1247-3 TB-C6CE1247-3 Fuel shutoff, right wing. To front of control pulley C6CE1248-3 TB-C6CE1248-3 Fuel shutoff, right wing. To rear of control pulley C6CE1249-3 TB-C6CE1249-3 Throttle, right wing. To rear of engine control pulley C6CE1250-3 TB-C6CE1250-3 Throttle, right wing. To front of engine control pulley C6CE1251-3 TB-C6CE1251-3 Propeller pitch, right wing. To rear of propeller control pulley C6CE1252-3 TB-C6CE1252-3 Propeller pitch, right wing. To front of propeller control pulley C6CE1253-1 TB-C6CE1253-1 Fuel shutoff, left hand lever to wing. Upper cable, fuselage C6CE1254-1 TB-C6CE1254-1 Fuel shutoff, left hand lever to wing. Lower cable, fuselage C6CE1255-1 TB-C6CE1255-1 Throttle, left hand lever to wing. Lower cable, fuselage C6CE1256-1 TB-C6CE1256-1 Throttle, left hand lever to wing. Upper cable, fuselage C6CE1257-1 TB-C6CE1257-1 Propeller pitch, left hand lever to wing. Upper cable, fuselage C6CE1258-1 TB-C6CE1258-1 Propeller pitch, left hand lever to wing. Lower cable, fuselage C6CE1259-1 TB-C6CE1259-1 Fuel shutoff, right hand lever to wing. Lower cable, fuselage C6CE1260-1 TB-C6CE1260-1 Fuel shutoff, right hand lever to wing. Upper cable, fuselage C6CE1261-1 TB-C6CE1261-1 Throttle, right hand lever to wing. Lower cable, fuselage C6CE1262-1 TB-C6CE1262-1 Throttle, right hand lever to wing. Upper cable, fuselage C6CE1263-1 TB-C6CE1263-1 Propeller pitch, right hand lever to wing. Lower cable, fuselage C6CE1264-1 TB-C6CE1264-1 Propeller pitch, right hand lever to wing. Upper cable, fuselage C6CE1336-1 TB-C6CE1336-1 F uel shutoff, left wing. To front of control pulley C6CE1336-3 TB-C6C E1336-3 Fuel shutoff, left wing. To rear of control pulley C6CE1336-5 TB-C6CE1336-5 Fuel shutoff, right wing. To front of control pulley C6CE1336-7 TB-C6CE1336-7 Fuel shutoff, right wing. To rear of control pulley IMPORT SA04701NY Date of Issuance: February 1, 2022

Limitations & Conditions (Continued):

Eligibility Lists for DHC-6 Series 100, 200, 300 and 400 continued:

(Continued on Page 7 of 9) 6 9

RUDDER CONTROL OEM Part Number TB Part Number Description C6CF1150-1 C6CF1150-1 Station 455.0 to right hand side rudder control attachment C6CF1151-1 TB-C6CF1151-1 Station 455.0 to left hand side rudder control attachment EO 69053-6 TB-EO 69053-6 Station 455.0 to right hand side rudder control attachment EO 69053-7 TB-EO 69053-7 Station 455.0 to left hand side rudder control attachment C6CF1511-1 TBC6CF1511-1 Rudder quadrant inboard grove to Sta. 455.0 C6CF1511-5* TBC6CF1511-5 Rudder quadrant inboard grove to Sta. 455.0 C6CF1511-3 TBC6CF1511-3 Rudder quadrant inboard grove to Sta. 455.0 C6CF1511-7* TBC6CF1511-7 Rudder quadrant inboard grove to Sta. 455.0 *Applicable to DHC-6 SERIES 300 and 400 Only

AILERON CONTROL OEM Part Number TB Part Number Description C3CF201-5 TB-C3CF201-5 Forward aileron control C3CF204-5 TB-C3CF204-5 Aileron in wing C3CF205-5 TB-C3CF205-5 LH aileron balance C3CF259-5 TB-C3CF259-5 RH aileron balance

ELEVATOR CONTROL OEM Part Number TB Part Number Description C3CF195-7 TB-C3CF195-7 Elevator control up C3CF193-5 TB-C3CF193-5 Elevator control down C3CF194-9 TB-C3CF194-9 Elevator control down C3CF196-5 TB-C3CF196-5 Elevator control up C3CF580-3 TB-C3CF580-3 Inboard front trim interconnect C3CF581-3 TB-C3CF581-3 Inboard rear trim interconnect C3CF582-3 TB-C3CF582-3 Outboard front trim interconnect C3CF240-9 TB-C3CF240-9 Elevator lever stop cable

ELEVATOR CONTROL CABLE COMPONENTS OEM Part Number TB Part Number Description C 3CF411-3 TBC3CF411-3 Strap C3CF242-3 TBC3CF242-3 Strap C 3CF243-3 TBC3CF243-3 Fitting C3CF241-3 TBC3CF241-3 A rm C3CF240-4 TBC3CF240-4 Washer C3CF240-3 TBC3CF240-3 Stop IMPORT SA04701NY Date of Issuance: February 1, 2022

Limitations & Conditions (Continued):

Eligibility Lists for DHC-6 Series 100, 200, 300 and 400 continued:

7. The Eligibility Lists for DHC-3 are as follows:

(Continued on Page 8 of 9) 7 9

FAA Form 8110-2 (03/21) Page _8__ of ___ United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number:

RUDDER CONTROL OEM Part Number TB Part Number Description C3CF197-5 TB-C3CF197-5 LH front rudder control C3CF198-5 TB-C3CF198-5 LH rear rudder control C3CF199-5 TB-C3CF199-5 RH front rudder control C3CF200-5 TB-C3CF200-5 RH rear rudder control

WATER RUDDER CONTROL OEM Part Number TB Part Number Description C3UF60-9 TB-C3UF60-9 Water rudder control C3UF61-9 TB-C3UF61-9 Water rudder control C3UF76-6 TB-C3UF76-6 Rudder retraction fwd C3UF44-7 TB-C3UF44-7 Retraction center RH C3UF43-7 TB-C3UF43-7 Retraction center LH C3UF42-7 TB-C3UF42-7 Retraction aft C3UF46-5 TB-C3UF46-5 Balance C3UF132-5 TB-C3UF132-5 Cable- water rudder, used on C3UF140-5 C3UF152-3 TB-C3UF152-3 Water rudder C3UF153-3 TB-C3UF153-3 Water rudder retraction centre LH C3UF155-3 TB-C3UF155-3 Water rudder retraction centre RH

AILERON CONTROL OEM Part Number TB Part Number Description C2CF1121AND TB-C20F1121AND LH aileron control C2CF1133AND TB-C2CF1133AND RH aileron control

ELEVATOR CONTROL OEM Part Number TB Part Number Description C2CF813A TB-C20F813A Elevator control C2CF815A TB-C2CF815A Elevator control C2CF1563A TB-C2CF1563A Forward elevator trim tab

RUDDER CONTROL OEM Part Number TB Part Number Description C2CF741AND TB-C2CF741AND Forward rudder control C2CF1235AND TB-C2CF1235AND Rear rudder control C2CF1461A TB-C20F1461 A Rudder trim tab control Limitations and Conditions (Continued):

Eligibility Lists for DHC-3 continued:

8. T he Eligibility Lists for DHC-2 are as follows:

(Continued on Page 9 of 9) IMPORT SA04701NY Date of Issuance: February 1, 2022

WATER RUDDER CONTROL OEM Part Number TB Part Number Description C2UF181A TB-C2UF181A Port water rudder retraction C2UF183A TB-C2UF183A Starboard water retraction C2UF193A TB-C2l1F193A Rudder control balance C2UF417A TB-C2LlF417A Water rudder control Limitations and Conditions (Continued):

Eligibility Lists for DHC-2 continued:

----------END---------- IMPORT SA04701NY Date of Issuance: February 1, 2022