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270    HELICOPTER AIR SERVICE PROGRAM

6. CURRENT STATUS OF PT-6 DEVELOPMENT

400 PT-6 engines have been sold to date. Installations currently include the following production aircraft:

a. Beech Twin King Air - 160 on order, 14 delivered.

b. De Havilland Turbo Beaver - 100 on order, 5 delivered.

The following experimental installations have been completed or are contemplated:

a. Twin Otter.

b. Convair Coin.

c. The Helio Stallion.

d. Fairchild Porter.

e. Lockheed Rigid Rotor.

f. Piasecki 16H.

g. Twin engine installation in the Bell 204.

7. PT-6 CHRONOLOGY

November 1959 --- First run as a gas generator.
February 1960 --- First run as a complete engine.
September 1960 -- First 50-hour test.
May 1961 -------- First flight (in nose of Beech 18).
August 1961 ----- Official 50-hour PFRT - First flight of Hiller 1099 helicopter.
November 1961 --- 150-hour test of PT-6 Turboshaft.
February 1962 --- 150-hour test of PT-6 Turboprop.
May 1962 -------- First flight Piasecki 16H helicopter.
June 1962 ------- First prototype shipped on schedule.
October 1962 ---- First flight Lockheed XH-51A.
February 1963 --- First flight Otter DHV-3 STOL research twin turboprop.
May 1963 -------- First flight Kaman Huskie III helicopter.
October 1963 ---- FAA certification of PT-6.
November 1963 --- First United Air Canada Ltd.-Sikorsky discussion regarding joint development of S-58 with 3 PT-6.
December 1963 --- Initial production deliveries of PT-6.
April 1964 ------ First flight of single engine utility airplane with PT-6.
June 1964 ------- First flight of Hiller JL-5 helicopter.

8. MODIFICATION COSTS

One hundred fifty-thousand dollars per aircraft. (No provision in that value for existing 1,820 engines as a credit.)

(Appendix M, page 7, an engineering drawing showing installation of three PT-6 engines in S-58 helicopter is on file with the committee.)

Mr. MOORE. I refer also to appendix B, which is a copy of our present public timetable which shows the services we are now conducting.

Senator MONRONEY. Appendix B will be received for the committee files.

Mr. MOORE. In December of 1963, our CAB certificate was temporarily renewed for 3 years, pending a determination of whether Midway would be reactivated and a closer-in downtown heliport established.

In July of 1964, the largest airline serving Chicago - United - reactivated service to Midway Airport with four schedules per day. The growing congestion at O'Hare Field makes it inevitable that most of the other airlines serving Chicago will soon have to move a substantial number of their flights to Midway.