## PACIFICAEROSPACE

Pacific Aerospace Limited AirportRoad, Hamilton 

# MANDATORY SERVICE

PrivateBag3027,Hamilton3240,New Zealand TEL +6478436144 FAX +647 8436134 EMAIL pacific@aerospace.co.nz 

## PACSB I XL I 068 ISSUE 5 WEB www.aerospace.co.nz 

## FIN FORWARD PICKUP
1. PLANNING INFORMATION 

### A. EFFECTIVITY

B. REASON

C. DESCRIPTION

D. COMPLIANCE All PAL 750XL aircraft up to S/N XL-193 inclusive, XL-195 and XL-197.
There have been reported instances of cracking in the aft plate ofthe forward Fin Pickup Lug located atfuselage STN 337.00 on 750XL aircraft operated in agricultural and survey roles. Overtightening ofthe pickup boltwill result in additional loads being applied to the pickup, which is designed to allow rotation about the aircraft longitudinal axis. An inspection ofthefin forward pickup assennbly (consisting of P/N 11-10281-1, Qty 2 bonded together) is required to determine ifthere is any evidence ofcracking. If cracking is found the plates are to be replaced. This issue ofthe bulletin introduces a reduced torque setting for Fin Forward Pickup boltto alleviate some ofthe loads being applied to the pickup. Current Fin Forward Pickups (PIN 11-10281-1) are now Life Limited items and are to be replaced by new improved, nonlifed parts (P/N 11-03375-1) lAWAccomplishment instructions (also refer to modification PAC/XL/0629). Fin Forward Pickup replacement is a terminating action for this bulletin.
A. Forall effective PAL 750XL aircraft: At Next 150 Hour scheduled maintenance: 1) Reduce Fin forward pickup bolt torque to 45
- 55 in.lb. and re-lockwire. 2) Ifthe Fin has been removed lAWany issue ofthis bulletin, remove Qty 2 RudderTrim Driveshaft grub screws, apply Loctite 222 thread locker and refit.
B. For PAL750XL aircraftwith a Standard Categorv Airworthiness Certificate and greaterthan 2000 Hours TIS: 1) Carry out inspection lAW accomplishment instructions (Para. 2.A. & 2.8.) at next 150 Hour scheduled maintenance and thereafter at 600 Hour intervals, or annual inspection (whichever occurs first). 

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## PACIFICAEROSPACE PACSB 

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E. TOOLING
F. WEIGHTAND BALANCE 

### G. REFERENCE

H. HOURS REQUIRED

Page2 of9 

## ISSUE 5
2) At 6000 hours TTIS or within the next600 hours TIS, whichever is later, retire and scrap Fin Forward Pickup P/N 11-10281-1 and replace with P/N 11-03375-1, lAWaccomplishment instructions (Para 2.C. or2.0.). C. For PAL 750XL aircraftwith a Restricted Category Airworthiness Certificate and greaterthan 1000 Hours TIS: 1) Carry out inspection lAWaccomplishment instructions (Para. 2.A. & 2.B.) at next 150 Hour scheduled maintenance and thereafter at 600 Hour intervals, or annual inspection (whichever occurs first). 2) At 2000 hours TTIS or within the next 200 hours TIS, whichever is later, retire and scrap Fin Forward Pickup P/N 11-10281-1 and replace with P/N 11-03375-1 lAWaccomplishment instructions (Para 2.C. or 2.0.). As required to perform liquid penetrant inspection.
No change.
Maintenance Manual Chapters 04-00-00 & 55-30-00. Modification PAC/XL/0629.
A. B. 

## c. 2 Hours. 1) 6 Hours 2) 4 Hours. 1) 6 Hours 2) 4 Hours.

Issued: 29 June 2015

## PACIFICAEROSPACE

2. ACCOMPLISHMENT INSTRUCTIONS
INSPECTION
A. Visuallnspection: 1) Jack/trestle aircraft. 

## PACSB 

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## I 068 ISSUE 5

2) Remove the fin (vertical stabilizer) lAW Maintenance Manual chapter

### 55-30-00. 3) Carry out a detailed visual inspection ofboth the forward fin pickup platesfor any evidence ofcracking (referto Figure 

### 1 belowfor example). 

### 4) Ifthere is visual evidence ofcracking in eitherofthe two fin forward pickup plates then both plates must be replaced (referto para C. below). 

### 5) If no visual evidence ofcracking is found carry out liquid penetrant inspection as per para 

### B. below.

Issued: 29 June 2015 FIN FORWARD PICKUP (11-10281-1)
FIGURE 1 11-10281-1 FIN FORWARD PICKUP
Page 3 of 9

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B. Liquid Penetrant Inspection: 1) Preparefor a liquid penetrant inspection by removing paintfrom the external surfaces ofthe fin forward pickup plates extending abovethe fuselage. 2) Carry out a liquid penetrant inspection lAWASTM E1417 (or equivalentapproved standard) ofthefin forward pickup plates extending abovethefuselage for any evidence ofcracking. 3) Ifthere is evidence ofcracking in either ofthe two fin forward pickup plates then both plates must be replaced (referto para C. below). 4) If no evidence ofcracking is found, protectthe assemblywith paint lAWapproved maintenance procedures and install the fin (vertical stabilizer) lAW Maintenance Manual chapter 55-30-00.
REPLACEMENT
NOTE: If replacement is being carried out as result of cracking found during inspection lAW Para's A. and B., then proceed lAWwith Para C. Optionally, replacement can be carried out at any time without removing Fin Assembly, in which case proceed lAW with Para D.
C. Replacement of Fin Forward Pickup Plates (with Fin removed): (Referto Figures 1, 2 & 3) 1) Gain access to the interior ofthe rearfuselage section. 2) Remove roll pins from ruddertrim drivetube connecting sleeve (aft of Frame @ STN 221.67) and from forward end of ruddertrim drivetube universal (aft of Frame@ STN 337.00) (referto Figure 1). ' 

# +- FWD

FIGURE 1 STN 337.00 Nylon Bush

RUDDER TRIM DRIVE 3) Uncouple ruddertrim drive tube section and drawtube forward to clearthe frame and fin pickup at Frame@ STN 337.00. Remove the nylon bushing from fin forward pickup. 4) Carefully drill and remove the attachment rivets securing the forward fin attachment assembly and remove assembly from Frame @ STN 337.00.
Page 4 of 9 Issued: 29 June 2015

## PACIFICAEROSPACE PACSB I XL I 068 ISSUE 5

NOTE: Check for corrosion on the frame. If any is found, remove, treat the area and repaint lAWapproved maintenance procedures. 5) Using existing pickup assembly as a template, place over the newfin forward pickup assembly PiN 11-03375-1, install boltthrough the fin attachment bolt hole and clamp both assemblies securelywith the rivet holes correctly aligned. 6) Drill through the old pickup assembly into the new at the existing hole size. 7) Position newfin forward pickup assembly PiN 11-03375-1, and pin on existing holes in Frame@ STN 337.00. NOTE: Qty 3 MS20470AD4 rivets installed through PiN 11-45775 angle and skin may be uninstalled to facilitate installation ofthe Hi-Loks through fin pickup in the vicinity of PiN 11-45771 pulley bracket. Reinstall the angle using Qty 3 CR3213-4-01 rivets (Refer to Figure 3for detail). 8) Drill and ream holes (10 places) through the newfin forward pickup assembly and fuselage frame to 0.1890i0.1895. 9) Remove new pickup assembly, apply Duralac Jointing Compound on mating surfaces ofthe frame and pickup, and place back in position. 10) Install the new fin pickup plate to the frame assembly at STN 337.00 with HI-LOK pins, collars and washers. 11) Protectthe assembly with paint lAWapproved maintenance procedures. 12) Install nylon bushing in fin forward pickup with jointing compound. 13) Install rudder trim drive tube section through the frame and fin pickup at Frame @ STN 337.00. 14) Reconnect ruddertrim drivetube connecting sleeve (aft of Frame@ STN 221.67) and forward end of rudder trim drivetube universal (aft of Frame@ STN 337.00). Secure with roll pins and lockwire roll pins. NOTE: There is a Bonding Strap (PiN BON-5-1) fitted between the fin and the fuselage located in close proximity to the forward fin pickup. This bonding strap must be refitted when installing the fin. 15) Install the fin (vertical stabilizer) lAW Maintenance Manual chapter 55-30-00. NOTE: When installing the fin: a) Prior to installation, apply Duralac Jointing Compound on mating surfaces ofthe fin forward attachment lug and pickup. b) Torque bolt through forward pickup to 45 -55 in.lb. and lockwire bolt. c) When reconnecting the Rudder Trim system, ensure the driveshaft grub screws are secure, with Loctite 222 thread lockerapplied. 16) Carry out RudderTrim Tab rigging checks and duplicate inspection.

Issued: 29 June 2015 Page 5of9

## PACIFICAEROSPACE PACSB I XL I 068 ISSUE 5
D. Replacement of Fin Forward Pickup Plates (with Fin installed): (Referto Figures 1, 2 & 3) 1) Jack/trestle aircraft. 2) Remove forward fin pickup access panel. Remove lockwire, bolt and washerfrom forward fin attachmentfitting. 3) Gain access to the interior ofthe rear fuselage section. 4) Remove roll pins from rudder trim drive tube connecting sleeve (aft of Frame @ STN 221.67) and from forward end of rudder trim drive tube universal (aft of Frame @ STN 337.00) (refer to Figure 1 ). 5) Uncouple rudder trim drive tube section and drawtube forward to clearthe frame and fin pickup at Frame@ STN 337.00. Remove the nylon bushing from fin forward pickup. 6) Carefully drill and remove the attachment rivets securingthe forward fin attachment assembly and remove assemblyfrom Frame @ STN 337.00. NOTE: Check for corrosion on the frame. If any is found, remove, treat the area and repaint lAWapproved maintenance procedures. 7) Using existing pickup assembly as atemplate, place overthe newfill forward pickup assembly P/N 11-03375-1, install boltthrough the fin attachment bolt hole and clamp both assemblies securelywith the rivet holes correctly aligned. 8) Drill through the old pickup assembly into the new atthe existing hol-e size. 9) Position newfin forward pickup assembly P/N 11-03375-1, and pin on existing holes in Frame@ STN 337.00. NOTE: Qty 3 MS20470AD4 rivets installed through PIN H-45775 angle and skin may be uninstalled to facilitate installation ofthe Hi-Loks through fin pickup in the vicinity of PIN 11-45771 pulley bracket. Reinstall the angle using Qty 3 CR3213-4-01 rivets (Refer to Figure 3for detail). 10) Insertthe fin attachment boltthrough the new pickup assembly and fin and tighten. 11) Drill and ream holes (10 places) through the newfin forward pickup assembly and fuselage frame to 0.1890/0.1895. 12) Remove new pickup assembly, apply Duralac Jointing Compound Oil mating surfaces ofthe frame and pickup, and the fin forward attachment lug and pickup, and place back in position. 13) Install the newfin pickup plate on the Frame@ STN 337.00 with HI-LOK pins, collars and washers. 14) Protectthe assemblywith paint lAWapproved maintenance procedures. 15) Install nylon bushing in fin forward pickup with jointing compound. 16) Install ruddertrim drive tube section through the frame and fin pickup at Frame STN 337.00. 17) Reconnect rudder trim drive tube connecting sleeve (aft of Frame@ STN 221.67) and forward end of rudder trim drivetube universal (aft ofFrame@ STN 337.00). Secure with roll pins and lockwire roll pins. 18) Install the fin forward pickup bolt, torque to 45- 55 in.lb. and secure with lockwire. 19) Install forward fin pickup access panel and secure. 20) Carry out RudderTrim Tab rigging checks and duplicate inspection. Page 6of9 Issued: 29 June 2015

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FIGURE2 FIN FORWARD PICKUP INSTALLATION

Issued: 29 June 2015 

## PACSB 

## I XL 

## I 068 ISSUE 5


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View Looking Aft on Frame at STN 337 CR3213-4-01 RIVET 11-45771 PULLEY BRACKET 11-03375-1 FIN PICKUP Detail of Pickup fasteners
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## PACIFICAEROSPACE

3. CERTIFICATION
Record compliance with this bulletin in the aircraft Log Book. 

### 4. MATERIAL REQUIRED: 

## PACSB 

## I XL 

## I 068 ISSUE 5

Iftheforward fin pickup is to be replaced then the following parts are required. Contact PAL for parts availability.

**Descri~tion** Part Number

**Qt~** Reguired FIN PICKUP- FORWARD- STN 337.00 11-03375-1 1 PIN (HI-LOK) HL18PB-6-5 10 ALTERNATE PART PIN (HI-LOK) HL18-6-5 10 COLLAR AND WASHER HL94W-6 10 ALTERNATE PART COLLAR (HI-LOK) HL94-6 10 DURALAC DTD 369 B 1305-1 AiR (JOINTING COMPOUND) THREAD LOCKER LOCTITE 222 AiR ROLL PIN MS171496 3 ALTERNATE PART ROLL PIN 9048-069 3 RIVET CR3213-4-01 3

Issued: 29 June 2015 Page 9of 9