14 CFR Appendix C to Part 23, Basic Landing Conditions

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Appendix C to Part 23 - Basic Landing Conditions

[C23.1 Basic landing conditions]

Condition Tail wheel type Nose wheel type
Level landing Tail-down landing Level landing with inclined reactions Level landing with nose wheel just clear of ground Tail-down landing
Reference section 23.479(a)(1) 23.481(a)(1) 23.479(a)(2)(i) 23.479(a)(2)(ii) 23.481(a)(2) and (b).
Vertical component at c. g nW nW nW nW nW.
Fore and aft component at c. g KnW 0 KnW KnW 0.
Lateral component in either direction at c. g 0 0 0 0 0.
Shock absorber extension (hydraulic shock absorber) Note (2) Note (2) Note (2) Note (2) Note (2).
Shock absorber deflection (rubber or spring shock absorber), percent 100 100 100 100 100.
Tire deflection Static Static Static Static Static.
Main wheel loads (both wheels) (Vr) (n-L)W (n-L)W b/d (n-L)W a′/d′ (n-L)W (n-L)W.
Main wheel loads (both wheels) (Dr) KnW 0 KnW a′/d′ KnW 0.
Tail (nose) wheel loads (Vf) 0 (n-L)W a/d (n-L)W b′/d′ 0 0.
Tail (nose) wheel loads (Df) 0 0 KnW b′/d′ 0 0.
Notes (1), (3), and (4) (4) (1) (1), (3), and (4) (3) and (4).

Note (1). K may be determined as follows: K = 0.25 for W = 3,000 pounds or less; K = 0.33 for W = 6,000 pounds or greater, with linear variation of K between these weights.

Note (2). For the purpose of design, the maximum load factor is assumed to occur throughout the shock absorber stroke from 25 percent deflection to 100 percent deflection unless otherwise shown and the load factor must be used with whatever shock absorber extension is most critical for each element of the landing gear.

Note (3). Unbalanced moments must be balanced by a rational or conservative method.

Note (4). L is defined in § 23.725(b).

Note (5). n is the limit inertia load factor, at the c.g. of the airplane, selected under § 23.473 (d), (f), and (g).

[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as amended by Amdt. 23-7, 34 FR 13099, Aug. 13, 1969]

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United States Code

Title 14 published on 03-May-2017 03:58

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 14 CFR Part 23 after this date.

  • 2017-04-24; vol. 82 # 77 - Monday, April 24, 2017
    1. 82 FR 18841 - Special Conditions: Viking Air, Ltd., Models DHC-6-100/-200/-300; Avmax Aviation Services, Inc., Installation of Rechargeable Lithium Batteries
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Final special conditions; request for comments.
      The effective date of these special conditions is April 24, 2017. We must receive your comments by June 8, 2017.
      14 CFR Part 23