# Airworthiness Directive Pacifi c Aerospace 750XL Aircraft I CIVIL loVV.TION AUTHORITY I OF NEWZ C AIJ\ND
Issued by the Civil Aviation Authority of New Zealand in accordance with section 721(3A) of the Civil Aviation Act . An Airworthiness Directive (AD) contains regulatory information whi ch is mandatory. An operator of an aircraft must not operate the aircraft unless the operator complies with every applicable AD issued by the Director in accordance with section 721(3A) of the Civil Aviation Act . An AD is issued where the Director believes on reasonable grounds that an unsafe condition exists in an aircraft or aeronautical product. DCA/750XU 1 8

Applicability: Note:
Requirement:

Compliance:

Effective Date: Background: Fin Forward Pickup - Inspection Model PAL 750XL aircraft, SIN all through to 193, 195 and 197. This AD supersedes DCA1750XU16A to introduce the requirements in Pacific Aerospace Limited Mandatory Service Bulletin (MSB) PACSB/XU068 issue 5, dated 29 June 2015 . The revised MSB introduces a life limit for fin forward pickup P/N 11-10281-1 and reduces the torque setting for the fin forward pickup bolt to alleviate some of the loads applied to the pickup
. The MSB also introduces a new improved replacement fin forward pickup P/N 11-03375-1 which is not life limited
. To prevent failure ofthe fin forward pickup due to poss ible fatigue cracks, accomplish the following requirements per the instructions in Pacific Aerospace Limited Mandatory Service Bulletin (MSB) PACSB/XU068 issue 5, dated 29 June 2015 : 1. Reduce the fin forward pickup bolt torque per the instructions in PACSB/XU068 issue 5 . If the fin has been removed , then remove the two rudder trim driveshaft grub screws and apply Loctite 222 thread locking compound and refit the grub screws per the instructions in PACSB/XU068 issue 5. 2. Visual and Dye Penetrant Inspections: Accomplish the inspection requirements in paragraphs 2 .A and 2 . B of PACSB/XU068 issue 4 . If any cracks are found , accomplish the instructions in paragraphs 2 .C of PACSB/XU068 issue 5 , before further flight. 3 . Fin forward pickup replacement: Remove fin forward pickup P/N 11-1 0281-1 and replace with PIN 11 -03375-1 per the instructions in paragraphs 2 .C or 2 . D of PACSB/XU068 issue 5. (PACSB/XU068 , occurrences 12/4698, 12/4699 and 14/1898 refer) 1 . For all aircraft affected by this AD : At t he next 150 hour scheduled maintenance inspection. 2 . For standard category aircraft: At 2000 hours TTIS or the next 150 hour scheduled maintenance i nspection, whichever is the later, unless previously accomp lished, and thereafter at intervals not to exceed 600 hours TIS or annual inspection , whichever occurs sooner. For restricted category aircraft: At 1000 hours TTIS or the next 150 hour scheduled maintenance inspection , whichever is the later, unless previously accomplished, and thereafter at intervals not to exceed 600 h ours TIS o r annual inspection , whichever occurs sooner. 3 . For standard category aircraft: At 6000 hours TTIS or within the next 600 hours TIS , whichever occurs later. For restricted category aircraft: At 2000 hours TTIS or within the next 200 hours TIS, whichever occurs later
. 30 July 2015 This AD with effective date 30 July 2015 supersedes DCA1750XU16A to introduce the requirements in Pacific Aerospace Limited Mandatory Service Bulletin (MSB) PACSB/XU068 issue 5 , dated 29 June 2015 . The revised MSB introduces a life limit for fin forward pickup P/N 11-10281-1 and reduces the torque setting for the fin forward pickup bolt to alleviate some of the loads app li ed to the pickup
. The MSB also introduces a new improved replacement fin forward pickup P/N 11-03375- 1 which is not life limited
.

Owen 0//s 

### Airworthiness Specialist Delegate ofthe CivilAviation Authortiy ofNew Zealand 30 July 2015

## PACIFICAERO SPACE Padfk: Aerosp9C8 I irnitcd Airpor t Read, Hamilton 

# MANDATORY SERVICE Prlvsto Sag 3027, Hemilt.on 3240, NAW Zealan d TEL

**-~o6 4**  7 843 6144 FAX +64 7 843 6134 EMAIL pacif\c@eercY..pace.co.m 

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

## FIN FORWARD PICKUP 1. PLANNING INFORMATION A. EFFECTIVITY 

### B. REASON ·



### C. DESCR IPTION



## D. COMPLIANCE All PAL 750XL aircraft up to S/N XL-193 inclusive, XL-195 and X L -197. There have been reported instances of cracking in the aft plate of the forwa rd Fin Pickup Lug located at fuselage STN 337.00 on 750XL aircraft operated in agricultu ral and survey roles. Over tightening ofthe pickup bolt will result in additional loads being applied to the pickup, which is designed to allow rotation about the aircraft longitudinal axis . An inspection of the fin forward pickup assembly {consisting of P/N 11 - 10281-1, Qty 2 bonded together) is required to determine 

### if there is any evidence of cracking . If cracking is fo u nd the plates are to be replaced. This issue of the bulletin introduces a reduced torque setting for Fin Forward Pickup bolt to alleviate some of the 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) lAW Accomplishment instructions (also refer to modification PAC/XU0629)
. Fin Forward Pickup replacement is a term inating action for this bulletin. 

### A. For all effective PAL 750XL aircraft: At Next 150 Hour scheduled maintenance: 1) 

### Reduce Fin forward pickup bolt torque to 45- 55 in.lb. and re-l ockwi re. 2) 

### I f the Fi n has been removed lA W any issue of this bulletin , remove Qty 2 Rudder T rim Driveshaft grub screws, apply Loctite 222 thread locker and refit. 

### B. For PAL 750XL aircraft with a Standard Category Airworth iness Certificate and greater than 2000 Hours T I S: 1) Carry out inspection lAW accomplishment i nstructions (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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Iss ued: 29 June 2015 Page 1 of 9

# P A CIFIC AEROSPACE PACSB 

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## I 068

E. TOOLING F. WEIGHT AND BALANCE G. REFERENCE
H . HOURS REQUIRED

Page 2 of9 

## ISSUE 5 2) At 6000 hours TTI S or within the next 600 hours TIS, whichever is later, retire and scrap Fin Forward Pickup P/N 11 -1028 1-1 and replace with PIN 11-03375- 1 , lAW accomplishment instructions (Para 2.C
. or 2.D.). C. For PAL 750XL aircraft with a Restricted Category Airworthiness Certificate and greater than 1000 Hours TIS: 1) Carry out inspecti on lAW accomplishment instructions (Para. 

### 2A & 

### 2.8.) at next 150 Hour scheduled maintenance and thereafter at 600 Hour intervals, or annual inspection (wh ichever occurs first). 2) At 2000 hours TTIS or wi thin the next 200 hours TIS, whichever is later, retire and scrap Fin Forward Pickup P/N 11-10281-1 and rep lace with P/N 11-03375-1 lAWaccompl ishment 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 Hou rs. 1) 6 Hours 1) 6 Hours 2) 4 Hours. 2) 4 Hours .

I ssued: 29 June 2015

## PACIFIC AEAOSPACE

2. ACCOMPLISHMENT INSTRUCTIONS INSPECTION 

### A Visuallnspection: 1) Jack/trestle aircraft. 

## PACSB I XL I 068 ISSUE 5

2) Remove the fin (vertical stabilizer) lAW Maintenance Manual chapter 55-30-00. 3) Carry out a detailed visual inspection of both the forward fin pickup plates for any evidence of cracking (refer to Figure 1 below for example). 4) Ifthere is visual evidence of cracking in either of the two fin forward pickup plates then both plates must be replaced (refer to para C. below}. 5} If no visual evidence of cracking 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 of9

## PACIFICAEROSPACE PACSB I XL I 068 ISSUE 5 B. Liquid Penetrant Inspection: 1) Prepare for a liquid penetrant inspection by removing paint from the external surfaces of the fin forward pickup plates extending above the fuselage. 2) Carry out a liquid penetrant inspection lAW ASTM E1417 (or equivalent approved · standard) ofth e fin forward pickup plates extending above the fuselage for any evidence of cracking . 

### 3) If there is evidence of cracking in either of the two fin forward pickup plates then both p l ates must be replaced (refer to para C. below). 

### 4) If no evidence of cracking is found, protect the assembly with paint lAW approved maintenance procedures and install the fin (vertical stabilizer) lAW Maintenance Man ual 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 lAW with 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): (Refer to Fi gures 

### 1, 2 

### & 3) 1) Gai n access to the interior of the rear fuselage section. 

### 2) Remove roll pins from rudder trim drive tube connecting sleeve (aft of Frame 

### @ STN 221.67) and from forward end of rudder trim dr.ive tube universal (aft of Frame@ STN 

### 337 .00) (refer to Figure 

### 1). '

FIGURE 1 RUDDER TRIM DRIVE 

### 3) Uncouple rudder trim drive tube**se~t on**  and draw tube forward to clear the f rame 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 assemb ly and remove assembly from Frame 

### @ STN 

### 337.00.



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## - - - Page 4 of 9 Issued: 29 June 2015

## PACIFICAEROSPACE PACSB 

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## I 068 ISSUE 5 NOTE: Check for corrosion on the frame. If any is found, remove, treat the area and repaint lAW approved maintenance procedures. 5) Using existing pickup assembly as a template, place over the new fin forward pickup assembly P/N 11-03375-1, install bolt through the fin attachment bolt hole and clamp both assemblies securely with the rivet holes correctly aligned. 6) Drill through the old pickup assembly into the new at the existing hole size. 7) Position new fin 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 P/N 11 -45775 angle and skin may be uninstalled to facilitate installation of the 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 t o Figure 3 for detail). 8) Drill and ream holes (10 pl aces) through the new fin forward pickup assembly and fuselage frame to 0.1890/0
. 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) Protect the assembly with paint J AW approved 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 rudder trim drive tube connecting sleeve (aft of Frame@ STN 221.67) and forward end of rud der trim drive tube un iversal (aft of Frame@ STN 337.00). Secure with roll pins and lockwire roll pins. NOTE: T here is a Bonding Strap (P/N BON-5-1) fitted between the fin and the fuselage located in close proximity to the forwa rd fin pickup. Th is 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 

### of the fin forward attachment lug and pickup. b) 

### Torque bolt through forward pickup to 45- 55 in.lb . and lockwire bolt. c) \Nhen reconnecting the Rudder Trim system, ensure the driveshaft grub screws are secure, with Loctite 222 thread locker applied. 16) Carry out Rudder Trim Tab rigging checks and duplicate Inspection
.

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**-- ----**  **---- -------**  Issued: 29 June 2015 

### Page 5 of 9

# PACIFICAEROSPACE PACSB 

## I XL 

## I 068 ISSUE 5 D. Replacement of Fin Forward Pickup Plates (with Fin installed): (Refer to Figures 1, 2 

### & 3) 1) Jack/trestle aircraft. 2) Remove forward fin pickup access panel. Remove lockwi re, bolt and washe r from forward fin attachment fitting. 3} Gain access to the interior of the 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 draw tube forward to clear the frame and fin pickup at Frame@ STN 337.00. Remove the nylon bushing from f in forward pickup. 6) Carefully drill and remove the attachment rivets securing the forward fin attach ment assembly and remove assembly from Frame @ STN 337.00. NOTE: Check for corrosion on the frame. If any is found, remove, treat the area and repaint lAW approved maintenance procedures. 

### 7) Using existing pickup assembly as a template , place over the new fin forward pickup assembly PIN 11-03375-1 , Install bolt through the fin attachment bolt hole and clamp both assemblies secure ly with the ri vet holes correctly aligned. 

### 8) Drill through the old pickup assembty into the new at the existing hole size. 9) Position new fin forward pickup assembly PIN 11-03375-1 , and pin on existing holes in F rame@ STN 337.00. NOTE: Qty 3 MS20470AD4 rivets installed through P/N 1'3-45775 angle and skin may be uninstalled to facilitate installation of the Hi-Loks through fin pickup in the vicinity of P/N 11-45771 pulley bracket. Reinstall the angle using Qty 3 CR3213-4-01 rivets (Refer to Figure 3 for detail). 10) Insert the fin attachment bolt through the new pickup assembly and fin and tighten. 11) Drill and ream holes (10 places) through the new fin forward pickup assembly and fuselage frame to 0.1890/0.1895
. 12) Remove new pickup assembly, apply Duralac Jointing Compound on mating surfaces ofthe frame and pickup, and the fin forward attachment lug and pickup, and place back in position
. 13) Install the new fin pickup plate on the Frame@ STN 337 .00 with HI-LOK pins, collars and washers
. 1 4) Protect the assembly with paint lAW approved maintenance procedures
. 15) Install nylon bushing i n fin forward pickup with jointing compound
. 16) I n stall rudder trim drive tube section through the frame and fin pickup at Frame STN 337.00. 17} Reconnect rudder trim d rive tube connecting sleeve (aft of Frame 

### @ STN 22 1.67) and forward end of rudder trim drive tube universal (aft of Frame@ 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 Rudder Trim Tab rigging checks and duplicate i nspection. Page 6 of 9 Issued: 29 June 2015

## PACIFIC AEROSPACE



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FIGURE2 FIN FORWARD PICKUP INSTALLATION Issued : 29 June 2015 

## PACSB 

## I XL 

## I 068 ISSUE 5

Page 7 of9"'0Ol(0<1>():)Q.(!)iii(/)R1\.)(!)<-c:J<1>1:5.....()'I.,(5c:;omwzrE5zI0mF)>11-45771PULLEYBRACKET11-45775ANGLEViewLookingAftonFrameatSTN337CR3213-4-01RIVET11-45771PULLEYBRACKET11-03375-1FINPICKUPDetailofPickupfasteners(Skinremovedforclarity)n-Tl-nJ>m]J0co[)mV')to""XVirV')'CoUIOO

## PACIFICAERO SPACE

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

### 4. MATERIAL REQUIRED: 

## PACSB 

## I XL 

## I 068 ISSUE 5

Ifthe forward fin pickup is to be replaced then the fo ll owi ng parts are req uir ed. Contact PAL for parts availability. Descri!;!tion Part Number**Qt~** Reguired 

### FIN PICKUP - FORWARD- STN 337.00 11-03375-1 1 PIN (HI-LOK) HL 18PB-6-5 10 ALTERNATE PART PIN (HI-LOK) HL 18-6-5 10 COLLAR AND WASHER HL94W -6 10 ALTERNATE PART COLLAR (HI - LOK) HL94-6 10 DURALAC DTD 369 8 1305-1 AIR (JOINTING COMPOUND) THREAD LOCKE R LOCTITE 222 AIR ROLL PIN MS171496 3 ALTERNATE PART ROLL PIN 9048-069 3 RIVET CR3213-4-01 

### 3

Issued: 29 June 2015 Page 9 of9