STC SA4375NM

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA4375NM This certificate issued to: A.M. Luton Part * of the Regulations. See STC SA3777NM for certification basis.

Original Product -Type Certificate Number: A-815 Make: de Havilland of Canada Model: DHC-3 (normal category) as modified by STC SA3777NM Description of Type Design Change: Installation of EDO model 7490 Amphibious Floats and EDO Model 7170 Seaplane Floats in accordance with the following installation instructions and drawings:

EDO Models: Installation Drawings 7490 (Amphibious) 23300 (Revision Cb) April 9, 1957 7170 (Seaplane) 12700 (Revision Ca) January 11, 1957 Limitations and Conditions: . Approval of this change applies to the above model aircraft with the Serv- Aero Pratt and Whitney PT6A-135 or PT6A-135A turbine engine installation in accordance with Serv- Aero Engineering, Inc. STC SA3777NM. This approval should not be extended to aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the relationship between this change and any of those or other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft.

A copy of this Certificate, Pilot's Operating Handbook and FAA Approved (See Continuation Sheet)

Date of Application: August 29, 1988 Date Reissued:

Date of Issuance: November 23, 1988 Date Amended: April 19, 1989; March 21, 1990, June 20, 1994 FEDERAL AVIATION By Direction of the Administrator as.

(Signature) TOMINISTRATIOR Acting Manager, Seattle Aircraft Certification Office (Title)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA4375NW Limitations and Conditions: continued:

Flight Manual Supplement No. 041288 for STC SA3777NM dated June 2, 1988, or later FAA approved revisions and copy of FAA Approved Flight Manual Supplement No. 040389 for STC SA4375NM, Rev. A, dated June 20, 1994, or later FAA approved revisions must be maintained as part of the permanent records for the modified aircraft.

Supplemental Type Certificate Addendum No. SA4375NM The conditions and limitations of Supplemental Type Certificate No. SA3777NM apply except as follows:

Supplemental Type Certificate Holder: A.M. Luton Model - DHC-3, 16 PCSM (Seaplane only, normal category), as modified by STC SA3777NM and STC SA4375NM Propeller & Propeller Limits Hartzell HC-B3TN-3DY/T 10282 Diameter: Maximum 102.5 In.

Minimum: 100.5 In.

Blade Angle Limits: Feather 87° + 1° (measured at 30 In. Low Pitch Stop: 21° + 0.1° station) Reverse: -15 ° + 0.5° Take-off and Maximum, Continuous R.P.M.: 1,900 Minimum Cruise R.P.M.: 1,600 Hartzell HC-B3TN-3DY/T10282+4 Diameter: Maximum 106 In.

Minimum: 100.5 In.

Blade Angle Limits: Feather 87° ‡ 1° (measured at 30 In. Low Pitch Stop: 21° + 0.1° station) Reverse: -15 ° + 0.5° Take-off and Maximum, Continuous R.P.M.: 1,900 Minimum Cruise R.P.M.: 1,600

FAA FORM 8110-2-1 (10-69) PAGE 3 OF 4 PAGES

Hoited testates at Amenta Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA4375NM Limitations and Conditions: continued:

Airspeed Limits (CAS) Seaplane (mph) (knot) Maximum Operating Limit Speed VMO 137 119 Maneuvering VA 129 112 Flaps Extended VFE 95 83 Center of Gravity C. G. Range Seaplane with Mod. 3/746 (Item 104) (in.) (+131.9) to (+148.3) at 6600 Ib. or less (+135.8) to (+148.3) at 7600 lb.

(+138.1) to (+148.3) at 8000 Ib.

Seaplane: 7200 Ib. (With item 100) 7967 Ib. (With items 100, 101, 102, and 103) 8000 Ib. (With items 104 and 105)

- END -

FAA FORM 8110-2-1 (10-69) , PAGE 4 OF 4 PAGES