Flight Evaluation of the UH-60A Helicopter with the Pitch Bias Actuator Centered and Electrically Disconnected

Abstract

Testing was conducted to evaluate handling qualities of the UH-60A helicopter with the pitch bias actuator (PBA) centered and electrically disconnected and with various modes of automatic flight control system (AFCS) degradation. A total of 46.4 productive flight hours were flown between 4 April 1985 and 2 July 1986. Two shortcomings and two Prime Item Development Specification noncompliances were identified. The handling qualities of the UH- 60A helicopter with the PBA centered and electrically disconnected are essentially unchanged from those with the PBA operational, except for; (1) slightly degraded static longitudinal stability, (2) slightly degraded dynamic stability, and (3) a shortcoming, the poor maneuvering stability characteristics. One additional shortcoming is the strong pitch-due-to-sideslip coulping, which is unrelated PBA centered and electrically disconnected are satisfactory to continue flight under both visual and instrument meteorological conditions with any degradation of the AFCS.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1986
Accession Number
ADA183954

Entities

People

  • Gary L. Skinner
  • Michael K. Herbst
  • Reginald C. Murrell
  • Robert A. Williams
  • Roy A. Lockwood

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Army Aviation
  • Auxiliary Power Units
  • Computers
  • Control Panels
  • Control Systems
  • Engineering
  • Engineers
  • Failure Mode And Effect Analysis
  • Flight Control Systems
  • Helicopters
  • Insensitive Explosives
  • Test And Evaluation
  • Test Methods
  • Three Dimensional
  • Transducers
  • Turbines

Readers

  • Aerospace Engineering
  • Atmospheric Science/Meteorology