# ~PILATUS~ TM-06-000004 I s s ue 01 , Page 1 of 4 16

. 05 .2 013 Te c h n i ca l M e m o



### METRIC RIVET ISSUE - FERRY F LI GHT CONDITION

1 INTRODUCTION Metric rivets with an ultimate shear allo w able of about 50% w ere installed on several PC·6 assemblies on ne w productio n aircraft and some spare parts

. The affected in
- service PC-6 are MSN 735 , 863 , 909, 923 , 948 , 956 , 958 , 977, 978 , 979 , 980 , 981 , 982, 985 and 986. The affected rivets are Solid Rivet , Univers a l Head , Alumin i um Alloy 2117·T4 w ith a diameter 3.0mm and 3.5mm having specific lengths

. The affected P I N's are: • P I N 939.16.81.275 Soli d Rivet , Universal Head , Aluminium Alloy 2117
- T4 , 3

. 0*6 • P I N 939.16.81.277 Soli d Rivet , Universal Head , Aluminium Alloy 2117-T4 , 3

. 0 * 7 • P I N 939

. 16.81.301 Soli d Rivet , Univ e rsal Head, Aluminium Alloy 2117-T4 , 3

. 5*8 • P I N 939.16.81

. 303 Soli d Rivet , Universal Head , Aluminium Alloy 2117·T4, 3

. 5*10 • P I N 939.16.81.304 Soli d Rivet , Univers a l Head , Aluminium Alloy 2117-T4 , 3

. 5 * 11 The affected rivets must be replac e d. A ferry flight to a repair station might be necessary. The scope of this memo is to define the ferry flight condition and a pre-flight inspection

. 

### 2 MAIN SECTION 

### 2

. 1 AFFECTED STRUCTURE The affected PC
- 6 are not affected to the same e x tent. Figure 6
- 3 and Table 7 - 1 provide an overview of the affected structural areas and serve as basis for the pre·flight inspection defined in the ne x t chapter. Not affected are the components flap , horizontal stabilizer, elevator , cockpit doors and cabin doors

. 

### 2.2 INSPECTION BEFORE FERRY FLIGHT Before a potentially necessa ry ferry flight the following pre-flight inspection shall be performed. P

e rform a visual inspection of the aircraft skins as being identified as affected in the previous chapter. The inspection focus is on loose or missing rivets

. If affected by the wing , perform an additional visual inspection as follo w s.

TO EA SA CC Departm e nt ECE E CE EC ECV E Ap prova l s Author Ch ec k e d Approved Verified A p proved Name M. , K e ll , r J M an g old M . Ke i se r D. Bre tsc her A . vo n R otz B
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### TM - 06 - 000004 Issue 01 , Page 2 of 4 16.05.2013



###  Remove access panels LB10 and RB9 to get access to wing strut fitting installation area as per AMM 57

- 00

- 02. See Figure 6

- 1
.  Inspect shear field and vertical s tiffen er rivet positions 1 to 8 as identified Figure 6

- 2 with the aid of a lamp and inspection mirror for any signs of rivet deterioration
. If any sign of deterioration is found, contact Pilatus for assistance. 2.3 FERRY FLIGHT CONDITI ON The scope of the ferry flight condition is to define a minimum airframe loading for a potentially necessary ferry flight to the repair station.

 Flight to be made in calm air conditions

 No abrupt manoeuvres

 Maximum bank angle of 45 °

 Maximum speed not to exceed VC = VA = 119 knots IAS

 Minimum Fuel required for ferry flight

 Empty cabin except empty seats 

### 3 PILATUS POSITION Successful completion of the pre

- flight inspection and considering the ferry flight condition defined in this memo the PC

- 6 affected by the rivet issue satisfies the continued airworthiness for a one time ferry flight to a repair station. 

### 4 REFERENCES [1] 

### Document No. 01975 , PC

- 6 B2

- H2/B2

- H4 Aircraft Maintenance Manual 

### 5 REVISIONS Issue 01: Initial Issue

### TM - 06 - 000004 Issue 01 , Page 3 of 4 16.05.2013



### 6 FIGURES

Figure 6 - 1 Wing Access Panels LB10 and RB09

Figure 6 - 2 Shear Field and Vertical Stiffeners above Wing Strut Attachment Fitting 4 1 2 3

6 7

8 5 Side View

Up View

### TM - 06 - 000004 Issue 01 , Page 4 of 4 16.05.2013



### Figure 6 - 3 Affected Skins 

### 7 TABLES

Table 7 - 1 Affected Skins per MSN Tail Cone , short, Frames 12

- 13