---

meta-content-style-type: text/css meta-content-type: application/xhtml+xml; charset=utf-8 meta-description: CASA Airworthiness Directive meta-generator: Aspose.Words for .NET 22.10.0 meta-keywords: Issue 5/1995,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Wing - Main Spar Lower Cap Forward Flange at Wing Station 96,91 title: Airworthiness Directive - AD/AC/91 - Wing - Main Spar Lower Cap Forward Flange at Wing Station 96

?xml version="1.0" encoding="utf-8" standalone="no"?>

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

 

Image unavailable in extracted text Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes

 

AD/AC/91 Wing - Main Spar Lower Cap Forward Flange at Wing Station 96

Applicability: MODEL SERIAL NUMBERS (Inclusive) 500  618 to 750

560A 231 to 450

 

560E 433 to 750

 

680 242 to 658

 

680E 623 to 750

 

720 501 to 750

5/95

 

Requirement: 1.  Visually inspect for interference between the forward flange of the main spar lower cap and the outboard flange of the firewall assembly. Inspect in accordance with Twin Commander Service Bulletin (SB) 212, Accomplishment Instructions Part I.

 

2.        Inspect all aircraft, even those without interference, in the following order:

 

(a)     Remove a section of the wing to nacelle fairing at WS 96 in accordance with paragraphs a. and b. of Twin Commander SB 212, Accomplishment Instructions Part II.

 

(b)     Remove any interference in accordance with paragraphs c. and d. of Twin Commander SB 212, Accomplishment Instructions Part II.

 

(c)     Visually inspect the forward flange of the main spar lower cap for corrosion or other surface damage in the radius area.

 

(d)     Blend corroded or damaged areas with 180 grit abrasive paper, observing the precautions in the figure at the bottom of page 9 of Twin Commander SB 212.

 

(e)     Inspect the main spar lower cap for cracks using Fluorescent Dye Penetrant in accordance with Twin Commander SB 212, “Inspection Procedure”.

 

(f)      If the spar cap is not cracked, polish any reworked area to a finish of 32RMS or smoother.