# SB-GA8-2012-77

Issue 3

PO Box 881, Morwell, Victoria 3840, Australia MANDATORY Ph + 61 (0) 3 5172 1200 Fax + 61 (0) 3 5172 1201 www.gippsaero.com 

# Service Bulletin

SB-GA8-2012-77 Issue: 3 Date of Issue: 23/03/2012 P age 1 of 9 

### Subject:
Pitot Heat Connector at wing tip. 

### Applicability:
All GA8 serial numbers which have a heated pitot fi tted. This Service Bulletin is not applicable to G A8 aircraft modified by GippsAero Engineering Release ER-GA8-950216.


### Amendments:

1: Initial Issue. 2: Alleviation in compliance time if no damage foun d. Install kit added. Part number and illustration of ring terminals corrected. Dimension s for terminal strip and cover added. 3: Part number errors corrected for items 1,12,13 & 14. 

### Background:
GippsAero has received reports of a burnt 2 way con nector used for the pitot heater in the left hand wing tip. The heat resulting from such a failure m ay damage the pitot or static tubes. 

### Compliance:
Compliance with this Service Bulletin is required a t the next 100 hourly inspection. However if there is no evidence of charring associated with the connect or, compliance with Parts 2 to 4 of this Service Bulletin may be delayed until the next subsequent 1 00 hourly inspection, providing the modification is completed before the 7 th of February 2013.



### Weight and Balance:
Negligible effect on weight and balance. 

### Approval:
This modification has been approved pursuant to Reg ulation 21.095 of CASR (1998).SB-GA8-2012-77 Issue: 3 Date of Issue: 23/03/2012 P age 2 of 9



### Parts:
Kit SB-GA8-2012-77-1 may be purchased from GippsAer o. It contains:

Item Part Number Description Qty

1 GA8-243017-11 Terminal Cover Assembly 1

2 GA8-243027-23 Barrier Terminal 1

3 MS35206-216 Screw 2

4 AN960-4 Washer 4

5 AN960-6 Washer 4

6 MS21044N04 Nut 2

7 MS21045-06 Nut 2

8 RT2-4 Ring Terminal 4mm Blue 4

9 LHMS-S5-D Standoff 1

10 Commercial Placard, “T50”, Black lettering on white background. 1

11 TLED440 Pop Rivet 1

The following items may be used in lieu of items 1 & 2. Items 13 and 14 are to be modified in accordance with the instructions contained within t his Service Bulletin. Items 12,13 and 14 are not available from GippsAero.

Item Part Number Description Qty

12 MS18029-21 Nut/Snap 6-32 2

13 MS18029-1S-20 Terminal Cover 1

14 MS27212-1-20 Terminal Strip 1SB-GA8-2012-77 Issue: 3 Date of Issue: 23/03/2012 P age 3 of 9



### Parts Availability:
New parts can be purchased directly from GippsAero. Tel: +61 (0)3 5172 1200 Fax: +61 (0)3 5172 1201 Email: spares@gippsaero.com


### Labour:
4 hours should be allocated to the incorporation of this Service Bulletin. 

### Warranty:
Aircraft within the warranty period may claim from GA-warranty@gippsaero.com


### Installation:
Part 1. Inspection of the connectors P50 & J50 1. Remove the left hand wing tip from the aircraft. Wing tip removal instructions are provided in Section 57-30-00 of the Service Manual. NOTE: Tak e care as wiring to the Strobe/Nav light is still connected. 2. The electrical connection of P50 & J50 (Figure 1 ) must not be disconnected at this point in time. Look for signs of charring or discolouration of the connector housing. Inspect for signs of damage to the pitot or static lines in the near vic inity of the electrical connector.
3. In accordance with the directions stated in the Compliance statement of this Service Bulletin, Part 2 of this Service Bulletin is to be carried ou t. If carrying out Part 2 of this Service Bulletin immediately, proceed to Part 2, Step 2.

Figure 1 – View of connector P50.SB-GA8-2012-77 Issue: 3 Date of Issue: 23/03/2012 P age 4 of 9

Part 2. Wiring modification

1. Remove the left hand wing tip from the aircraft. Wing tip removal instructions are provided in Section 57-30-00 of the Service Manual. NOTE: Take care as wiring to the Strobe/Nav light is still connected. 2. The standard aircraft wiring to the heated pitot is shown in Figure 2. The modified wiring is shown in Figure 3.

Figure 2 –

Unmodified wiring to the pitot static tube assembl y.

Figure 3 - Modified wiring to the pitot static tube assembly.SB-GA8-2012-77 Issue: 3 Date of Issue: 23/03/2012 P age 5 of 9

3. Discard connector housings P50 and J50, and cut- off the spade terminals. 4. Fit item 2. Alternatively item 14 may be modifie d in accordance with Figure 4. This can be done by using a hacksaw. File away any “plastic” b urring.

Figure 4 - Dimensions of modified terminal strip.

Figure 5 - Terminal Strip installed (item 2).SB-GA8-2012-77 Issue: 3 Date of Issue: 23/03/2012 P age 6 of 9 Figure 6 - Ring terminals fitted.

5. Crimp the ring terminals (item 8) to the wire le ads. 6. Screw wire FH1C14 and wire FH1B14 to one stud. 7. Screw wire FH1D14 and wire FH1E14N to the second stud. 8. Placard “T50” to be fixed in near vicinity of th e terminal strip. 9. Fit the terminal cover as shown in Figure 7. Us e either item 1 or items 12 and 13 cut to length as shown in Figure 8.

Figure 7 - Terminal Cover fitted (item 1). T50SB-GA8-2012-77 Issue: 3 Date of Issue: 23/03/2012 P age 7 of 9 Figure 8 – Dimensions for modified cover.

10. The wiring to the navigation light and strobe i s to be checked. To ensure there is no possibility of chaffing as the wire passes through the lighteni ng hole to the lamps a nylon stand-off, item 9, is to be fitted using item 11 Refer to Figure 9

.

Figure 9

Part 3. Testing the Pitot-Heater & Pitot-Heat Cauti on Light System

WARNING: REMOVE ANY PROTECTIVE COVERS FITTED TO THE PITOT ST ATIC TUBE.
1. The pitot-heat caution system is functionally te sted as follows:
(i) Switch on Bus 1 Master ensuring the CAUTION SYS 1 circuit breaker is pushed in. (ii) With the pitot-heat switched off, check that t he amber pitot-heat caution light is illuminated. (iii) Observe the current draw for Bus 1. Switch o n pitot-heat. The current draw for Bus 1 should rise and indicate an increase of approximate ly 10A. (iv) Check that amber caution light extinguishes. (v) Immediately check the heater tube. It will beg in to warm if operating correctly.SB-GA8-2012-77 Issue: 3 Date of Issue: 23/03/2012 P age 8 of 9 CAUTION: ENSURE CAUTION WHILE TOUCHING THE TUBE TO AVOID BUR NING OF HAND.
2. If however the amber light remains on when the t ube is operating correctly, the sensor board located in the electrical overhead panel or the wir ing from that board to the Caution Unit is likely to be faulty. 3. Switch off the Pitot Heat. Check that the amber pitot-heat caution light illuminates

Part 4. Testing the Strobe and the Nav Light

CAUTION: AVOID LOOKING DIRECTLY AT THE STROBE LAMP.

1. The Strobe and Nav lights are to be checked for operation after installing the nylon stand-off.SB-GA8-2012-77 Issue: 3 Date of Issue: 23/03/2012 P age 9 of 9



### Documentation: Update the aircraft log book to reflect incorporati on of this Service Bulletin. 

### Continuing Airworthiness:
There are no additional continuing airworthiness re quirements as part of the implementation of this Service Bulletin.

Section 34-10-00 of the Service Manual as amended p rior to the approval date of this Service Bulletin is to be altered in the future. Until a revision n ote is issued by GippsAero, the directions containe d within this Service Bulletin for the testing of the pitot heater and heat caution light system shall b e followed. 

### Compliance Notice:
Complete the Document Compliance Notice and return to GippsAero by mail, fax or email.

## DOCUMENT COMPLIANCE NOTICE

Document: 

# SB-GA8-2012-77

Issue 3

Aircraft Serial Number: GA8-______________

Service Bulletin SB-GA8-2012-77 Issue 3 has been in corporated in the above aircraft.

Date: ______________________________________

___________________________________________ Signed

Print Name: _________________________________

Please post or fax this compliance notice to:

GippsAero Attn: Technical Services P.O. Box 881 Morwell Victoria 3840 Australia Fax.: +61 03 5172 1201