FAA AC 20-95 : 0
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
FATIGUE EVALUATION OF ROTORCRAFT STRUCTURE
Hardcopy , PDF
02-12-2003
English
SECTION 1 INTRODUCTION
1 BACKGROUND
SECTION 2 FLIGHT STRAIN MEASUREMENT PROGRAM
2 General
3 Instrumentation
4 Parts to be strain-gaged
5 Flight regimes and conditions to be investigated
SECTION 3 FREQUENCY OF LOADING
6 Type of operation
7 Loading spectrum
SECTION 4 FATIGUE STRENGTH EVALUATION
8 General
9 Analytical method
10 Testing methods
11 Combination replacement time and fail-safe evaluation
12 Extension of replacement time
SECTION 5 FAIL-SAFE STRENGTH EVALUATION
13 General
14 Identification of critical portions of primary structure
15 Extent of fail-safe damage
16 Determination of probable failure locations
17 Fail-safe demonstration
18 Inspection
TABLE 1 PERCENT OF OCCURRENCE
FIGURES 1 Power On - Rotor R.P.M. Airspeed Envelope
2 Power Off - Rotor R.P.M. Airspeed Envelope
3 Oscillatory off - Rotor R.P.M. Airspeed Envelope
4 Stress vs. Number of Cycles
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