Accession Number:

AD0611581

Title:

CATEGORY II ARCTIC EVALUATION OF THE YCH-47A HELICOPTER.

Descriptive Note:

Rept. for 10 Dec 63-6 Feb 64,

Corporate Author:

AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1964-12-01

Pagination or Media Count:

389.0

Abstract:

The YCH-47A helicopter was tested under arctic conditions at Eielson AFB, Alaska during the period 10 December 1963 to 6 February 1964. Testing consisted of flights both at moderately low 10F to -20F and very low temperatures -20F to -30F as well as ground operation down to -40F. Along with conducting an overall evaluation of the helicopters effectiveness in a cold environment, a number of improvements to correct earlier low temperature deficiencies were tested and found adequate. This report contains a description of the test procedures, selected instrumentation data, a discussion of the deficiencies uncovered and recommendations for their correction. Problems encountered in the Arctic were instability arising from SAS Stability Augmentation System operation, delamination of rotor blade fiberglass skins, and extreme difficulty in ground handling on hard packed snow, ice, or similar slippery surfaces. In order for the helicopter to be suitable for low temperature operation, new or modified rotor blades with assured structural integrity must be incorporated along with other improvements recommended in this report. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE