EASA AD No: 2012-0023

EASA Form 110 Page 1/3

EASA AIRWORTHINESS DIRECTIVE

AD No.: 2012-0023

Date: 06 February 2012

Note: This Airworthiness Directive (AD) is issued by EASA, acting in accordance with Regulation 

(EC) No 216/2008 on behalf of the European Community, its Member States and of the 

European third countries that participate in the activities of EASA under Article 66 of that 

Regulation.

This AD is issued in accordance with EC 1702/2003, Part 21A.3B. In accordance with EC 2042/2003 Annex I, Part M.A.301, the 

continuing airworthiness of an aircraft shall be ensured by accomplishing any applicable ADs. Consequently, no person may operate an 

aircraft to which an AD applies, except in accordance with the requirements of that AD, unless otherwise specified by the Agency [EC 

2042/2003 Annex I, Part M.A.303] or agreed with the Authority of the State of Registry [EC 216/2008, Article 14(4) exemption].

Type Approval Holder’s Name :

Fokker Services B.V.

Type/Model designation(s) :

F28 aeroplanes

TCDS Number: EASA.A.037

Foreign AD: Not applicable

Supersedure: None

ATA 52 Doors – Main Landing Gear Doors – Inspection / Modification

Manufacturer(s): Fokker Aircraft B.V.

Applicability: F28 Mark 0070 and Mark 0100 aeroplanes, all serial numbers.

Reason: In 2005, several occurrences were reported where the bracket of the rod in the 

Carbon Fibre Reinforced Plastic (CFRP) MLG outboard door had detached, 

preventing the MLG to lock properly when selected down. Prompted by these 

reports, CAA-NL issued AD NL-2006-001 (EASA approval 2006-0002) to 

require the inspection and modification of the attachment of the operating rod 

bracket as detailed in Fokker Service Bulletin (SB) SBF100-52-080.

After that AD was issued, several operators reported broken recessed heads of 

titanium attachment bolts of the operating rod bracket on modified (i.e. postSBF100-52-080) CFRP MLG outboard doors. In such a situation, the remaining 

bolt shafts can get pulled through the external repair patch and the carbon fibre 

door outer skin, causing the operating rod, with the detached bracket, to get 

stuck between the MLG main fitting and wing lower skin. The primary factor to 

the cause of breaking bolt heads has been determined to be incorrect 

adjustment of the MLG outboard door.

This condition, if not detected and corrected, would prevent the affected MLG 

from moving to the down and locked position, possibly resulting in MLG 

collapse during landing or roll-out and consequent damage to the aeroplane 

and/or injury to the occupants.

To address this potential unsafe condition, Fokker Services has published 

SBF100-52-090, providing modification instructions to install an improved
EASA AD No: 2012-0023

EASA Form 110 Page 2/3

attachment of the MLG outboard door operating rod.

For the reasons described above, this new AD requires a one-time detailed 

inspection for play or cracks in the recessed bolt heads and, depending on 

findings, applicable corrective actions, modification of the operating rod bracket 

attachment to the CFRP MLG outboard door, and introduction of a weaker 

(aluminium) bolt in the attachment of the MLG outboard door operating rod.

Effective Date: 20 February 2012

Required Action(s) 

and Compliance 

Time(s):

Required as indicated, unless accomplished previously.

(1) Within 9 months after the effective date of this AD, inspect the CFRP MLG 

outboard door for play or cracks in the recessed countersunk heads of the 

operating rod bracket attachment bolts in accordance with Part 1 of the 

Accomplishment Instructions of Fokker Services SBF100-52-090, or 

accomplish the modification as required by paragraph (3) of this AD.

(2) If, during the inspection as required by paragraph (1) of this AD, play or 

cracks are found in the countersunk bolt heads, and if CDL item 52-07

cannot be applied, before next flight, accomplish one of the actions

specified in paragraph B of part 1 of the accomplishment instructions of

Fokker Services SBF100-52-090.

(3) Within 24 months after the effective date of this AD, or prior to installation 

of a CFRP MLG outboard door (see Note below), whichever occurs later, 

modify the CFRP MLG outboard doors and attachment to the MLG in 

accordance with Part 2 of the Accomplishment Instructions of Fokker 

Services SBF100-52-090.

Note: As the aluminium MLG outboard doors and the CFRP MLG outboard 

doors are two-way interchangeable, the modification of paragraph (3) applies 

only to aeroplanes that currently have aluminium doors installed when such a 

door is (to be) replaced with a CFRP door. 

(4) From the effective date of this AD, do not install on an aeroplane any MLG 

outboard door having Part Number (P/N) D13310-401 through -418 or any 

MLG outboard door assembly having P/N D13312-401 through -410.

CAA-NL AD NL-2006-001 (EASA approval 2006-002) contains the 

requirement to modify all spare MLG outboard door assemblies having P/N 

D13312-401 through -410, to P/N D13312-7XX standard, in accordance 

with the instructions of Fokker Component Service Bulletin (CSB) D13312-

52-09.

(5) From the effective date of this AD, do not install on any aeroplane a P/N 

D13310-701 through -708 MLG outboard door or a P/N D13312-702 

through -711 MLG outboard door assembly, unless the component has 

been inspected and modified in accordance with the instructions of Fokker

CSB D13312-52-015.

Ref. Publications: Fokker Services SBF100-52-090 dated 17 November 2011.

Fokker CSB D13312-52-09 dated 12 December 2005.

Fokker CSB D13312-52-015 dated 17 November 2011.

The use of later approved revisions of these documents is acceptable for 

compliance with the requirements of this AD.

Remarks : 1. If requested and appropriately substantiated, EASA can approve 

Alternative Methods of Compliance for this AD.

2. This AD was posted on 05 January 2012 as PAD 12-001 for consultation 

until 02 February 2012. No comments were received during the 

consultation period.

3. Enquiries regarding this AD should be referred to the Safety Information 
EASA AD No: 2012-0023

EASA Form 110 Page 3/3

Section, Executive Directorate, EASA; E-mail ADs@easa.europa.eu.

4. For any question concerning the technical content of the requirements in 

this AD, please contact Fokker Services B.V., Technical Services Dept., 

P.O. Box 1357, 2130 EL Hoofddorp, The Netherlands;

telephone +31-88-6280-350; facsimile +31-88-6280-111;

e-mail: technicalservices@fokker.com.

The referenced publication can be downloaded from 

www.myfokkerfleet.com.