Fatigue and Stress | Landing Gear Flashcards
Side loads in cross winds should be __% of the vertical load combined with __% of the maximum ground reaction and __% of drag load
25 75 40
__ft/sec at the design landing weight should be capable of being absorbed
10, combined with a maximum aft drag component of 25%
__ft/sec at the design take off weight should be capable of being absorbed
6, combined with a maximum aft drag component of 25%
Fatigue life of a gear assembly is expressed as mean times between ___ and ___.
overhaul or replacement
The fatigue life of a gear assembly is affected by ___
- Gear up and down cycle
- Vibration from
- Wheels out of balance
- Airframe
- Corrosion
Surfaces used for aircraft must be ___ and ___
strong drained
The runway must be cored with grooves _ inches apart
2
ACN must not exceed the ___
PCN
The ___ expresses the relative effect of an aircraft on a runway pavement for a specified standard sub grade category
ACN
The ACN is twice the ___ ___-___ ___ expressed in kilograms, with single wheel tyre pressure standardised at 1.25 megapascals.
derived single-wheel load
The derived single-wheel load is a function of the ___-___ ___
sub-grade strength
The ACN covers four subgrades for flexible or rigid pavements:
- High
- Medium
- Low
- Ulta low
The reported PCN indicates that an aircraft with an ACN ____ ____ ____ ____ ____that can operate on the pavement, subject to tyre pressures and all up mass.
equal to or less than
For an aircraft with a ramp mass equal to or less than 5700kg, the following information is reported.
- Max allowable aircraft mass
- Max allowable tyre pressure
The PCN is expressed as a ___ part code, separated by forward slashes
5
The first letter expresses the ___ ___ of the pavement
assessed strength
The second letter is a _ or _, and shows whether the pavement has a rigid or flexible design
R F
A rigid surface is made of ___
concrete
A flexible surface is made of ___
asphalt
The third letter is a letter from _ to _ expressing the strength of what is underneath the pavement, called the ___.
A D subgrade
A subgrade of A is ___
very strong
A subgrade of D is ___
very weak
The fourth part of the code can be a letter or number expressing the ____
maximum tyre pressure that the pavement can support
Class W has a max tyre pressure of ___
No limit
Class X has a max tyre pressure of ___
1.5 MPa
1.5 MPa is ___ psi
217
Class Y has a max tyre pressure of ___
1.0 MPa
1.0 MPa is ___ psi
145
Class Z has a max tyre pressure of ___
0.5 MPa
0.5 MPa is ___ psi
72
The fifth part describes how the ___ value was worked out
first
A fifth letter T means a ___ ___
technical evaluation
