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de Havilland DHC-6 Twin Otter

DESIGN PHILOSOPHY:   Twin-engine, turbine-powered STOL utility aircraft with more cabin space and payload capability than the DHC-3 Otter. Convertibility to floats, intermediate-flotation tires and skis was a consideration from the outset.

Four basic "Series" have been produced:

SERIES 1: Prototype and 4 pre-production aircraft (S/N 1- 5). Maximum number of seats limited to 16 by the approved seating arrangement.

SERIES 100: S/N 6 -115. These aircraft had a larger door on the left side of the cabin (56 x 50 in vs. 46.5 x 45.5 in on the Series 1), and provisions for double seats on the right side of the cabin, thereby increasing the maximum number of seats to 21. The Series 1 and 100 were characterized by a "Short Nose" with a baggage compartment door on the front of the aircraft.

SERIES 200:  S/N 116 - 230 (Except 130 & 210 which were converted to Series 300). The Series 200 was characterized by a longer nose containing a larger forward baggage compartment, an extended (shelf) rear baggage compartment and larger baggage compartment doors.

SERIES 300:  S/N 130, 210, 231 & subsequent. This was the final production model and is characterized by having PT6-A27 engines, higher operating weights, escape hatches in the forward part of the cabin and deletion of the roof hatch. Conversion to a floatplane requires installation of the "short nose". The maximum number of seats is 22. Certification was completed to CAR-3 and SFAR-23 regulations.

SERIES 400:  New-production aircraft with PT6A-34/35 engines, glass cockpit, and numerous product improvements. Following the acquisition from Bombardier in early 2006 of Type Certificates and all legal rights to all out-of-production de Havilland aircraft, Viking Air of Victoria, British Columbia, announced in April 2007 its intention to proceed with restarting production of Twin Otters.  On Oct.1, 2008, the Series 400 Demonstrator (Series 300 refurbished and modified to the Series 400 standard) made its first flight.

Significant variants within these series include:

SERIES 110, 210, 310:  Certificated to British C.A.A. requirements, including short field performance.

SERIES 320:   Certificated to Australian D.C.A. requirements

The main differences between the series are summarized below:

SERIES

1

100/200

300

ENGINES

PT6A-20

PT6A-20

PT6A-27

MAXIMUM POWER (S/L, ISA, Static)

Takeoff (5 Minutes)

550 SHP

550 SHP

620 SHP

Max. Continuous

550 SHP

550 SHP

620 SHP

Max. Climb

538 SHP

538 SHP

588 SHP

Max. Cruise

495 SHP

495 SHP

588 SHP

WEIGHT (lb)

Maximum Takeoff

11,000

11,579

12,500

Maximum Landing

11,000

11,400

12,300

0.W.E. (Typical)

7,000

7,200

7,440

Wing Loading (lb/sq ft)

26.2

27.6

29.8

Power Loading (Ib/shp)

10.0

10.5

10.1

DHC-6 Twin Otter Fleet Statistics (as of March 2003)

Total Aircraft Produced

844

1966 - 1988

Total Aircraft Crashed

201

(unofficial stats)

Total Aircraft Parked/Scrapped

54

(unofficial stats)

DHC-6 Twin Otter Production List ...

PROPULSION

Engines:

2 x P&WC PT6-A27 (Turboprop)

Shaft Horsepower:

620

Propellers:

Hartzell 3-Bladed, Full-Feathering, Reversible

EXTERNAL DIMENSIONS

Wing Span

65 ft 0 in

Length

51 ft 9 in

Height

19 ft 6 in

Tailplane Span

.20 ft 8 in

Wheel Track

12 ft 2 in

Wheel Base

14 ft 10.5 in

Wing Area

420.0 sq ft

Aileron Area

33.2 sq ft

Flap Area

112.2 sq ft

Fin Area

48.0 sq ft

Rudder Area (Incl. tab)

34.0 sq ft

Tailplane Area

100.0 sq ft

Elevator Area (Incl. tabs)

35.0 sq ft

INTERNAL DIMENSIONS

Cabin Length

18 ft 6 in

Maximum Width

63.25 in

Maximum Height

59.0 in

Floor Area

80.2 sq ft

Volume

384 cu ft

Cabin Doors - Left

56 x 50 in

Cabin Doors - Right

30 x 45.5 in

Total Baggage Volume

126 cu ft

Passenger Seats (max)

22

PERFORMANCE

Maximum Operating Speed

170 Knots

Maximum Cruise Speed at 10,000 ft

182 Knots

Stalling Speed

56 Knots

Rate of Climb at SL - 2 Engines

1,600 ft/min

Rate of Climb at SL - 1 Engine

340 ft/min

Service Ceiling - 2 Engines

26,700 ft

Service Ceiling - 1 Engine

11,600 ft

Payload/Range (Normal Tanks,
45 Min Reserve):

100 NM / 4,280 lb

400 NM / 3,250 lb

775 NM / 0 lb

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Copyright 2002 XdH Aviation Services Inc.  All rights reserved.