AircraftDirectives
MembershipSign inCreate free account
Menu
Airworthiness Directive

AD 99-20-11 64 FR 52424 Active

Federal Aviation Administration · 14 CFR part 39

Requires accomplishing preflight checks of the fastening (knurled) nut at the rear control stick for cracks, and replacing the nut with one made of stainless steel either immediately or at a certain time period depending on…

Federal Register (opens in a new tab)FAA DRS (opens in a new tab)

FR document
99-25220
Amendment
39-11341
Published
1999-09-29
Effective
1999-10-21
Models covered
1

Last live check: 2026-08-19

Printed from https://aircraftdirectives.com/ad/99-20-11 · AircraftDirectives restates official FAA and manufacturer records; the official sources named on this sheet control. Not an airworthiness determination.

This page is a reference Record, not an airworthiness or compliance determination. Official FAA and manufacturer sources control over our restatement, subject to governing law. Check applicability, current requirements and incorporated documents before acting. The owner or operator remains responsible for airworthiness and required records under 14 CFR 91.403 and 91.417, as applicable. Terms of Use: /terms.

Opens your browser's print dialog. Choose “Save as PDF” to export a file. Keyboard: Ctrl+P or Cmd+P.

AD

99-20-11

FR doc 99-25220 · 64 FR 52424

AD 99-20-11Published 1999-09-29Effective 1999-10-21

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Requires accomplishing preflight checks of the fastening (knurled) nut at the rear control stick for cracks, and replacing the nut with one made of stainless steel either immediately or at a certain time period depending on whether a crack(s) is found.

Full official abstract

This amendment adopts a new airworthiness directive (AD) that applies to certain Burkhart Grob Luft-Und Raumfahrt GmbH & CO KG (Grob) Models G103 TWIN II and G103A TWIN II ACRO sailplanes. This AD requires accomplishing preflight checks of the fastening (knurled) nut at the rear control stick for cracks, and replacing the nut with one made of stainless steel either immediately or at a certain time period depending on whether a crack(s) is found. The checks are no longer required after the knurled nut is replaced. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified by this AD are intended to prevent the inability to use the rear control stick because of a cracked knurled nut, which could result in loss of control of the sailplane during flight instruction operations.

More directives for Grob

  1. AD 2025-20-07 Airworthiness Directives; Fiberglas-Technik Rudolf Lindner GmbH & Co. KG... Effective 2025-10-17
  2. AD 2022-05-14 Airworthiness Directives; GROB Aircraft SE (Type Certificate Previously ... Effective 2022-03-24
  3. AD 2022-03-08 Airworthiness Directives; Fiberglas-Technik Rudolf Lindner GmbH & Co. KG... Effective 2022-03-17
  4. AD 2017-08-12 Airworthiness Directives; GROB Aircraft AG Gliders Effective 2017-05-31
  5. AD 2016-12-08 Airworthiness Directives; GROB Aircraft AG Airplanes Effective 2016-07-20

All Grob directives

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)

Applies to 1 model in our index