# .+. Transport Canada Transports

Canada CF-2010-31 Issue Dale TP 7245E

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Number: 

# AIRWORTHINESS

CF·2010~31 3September 2010



# DIRECTIVE

Subject: Effective: Applicability: 

### Compliance: Background:

Corrective Actions: Fuel System Safety
- Introduction of Design Changes

21 September 2010 Bombardier Inc. Models DHC·8-400, DHC~8·401, DHC-8-402 aeroplanes, Serial Numbers 4003, 4004, 4006 and 4008 through 4205 Compliance is required as indicated unless already accomplished. Bombardier Aerospace has completed a system safety review of the aeroplanes fuel system againstfuel tanksafety standards introduced in Chapter 525 oftheAirworthiness Manual through Notice of Proposed Amendment (NPA) 2002-043, The identified non-compliances were then assessed using Transport Canada Policy Letter No. 525- 001, todetermine ifmandatory corrective action is required. The assessment showed that a number of modifications tothe fuel system are required to mitigate unsafe conditions that could result In potential ignition source within the fuel system. A. Applicable to aeroplanes Serial Numbers (SIN) 4003,4004,4006&4008through 4118. 1. Within 6000 hours air time after the effective date ofthis directive, incorporate the modifications detailed below:
a. Modsum 4-126330, FuelTank System Design Leftand Right Side (SFAR 88) Retrofit. Approved instructions for the incorporation of Modsum 4-126330 are contained in Bombardier Service Bulletin (SB) 84-57-09 Revision B, dated 3September 2008, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada, Incorporation of Modsum 4-126330 priortothe effective date ofthis directive according to the instructions contained in Revision A of Bombardier S8 84-57-09 meetsthe requirements ofthis paragraph_ b. Modsum 4-126366, Fuel Tank System and Fuel Indication - Wiring Identification, Segregation and Installation (High Level Sensor and Fuel Quantity Indication)
- Retrofit. Approved instructions for the incorporation of Modsum 4·126366 are contained In Bombardier SB 84-28-04 Revision B, dated 21 October 2009, or later revisions approved bythe Chief, Continuing Airworthiness, Transport Canada. Incorporation of Modsum 4-126366 priortothe effective date ofthis directive according tothe instructions contained inthe initial issue and Revision A of Bombardier S8 84-28-04 meets the requirements ofthis paragraph. Pur;u"nt 10CAR 202.51 lhs,rsqist.red owr.", ofa ca""dian aircraft snail, 'MUll" sevnn days. notify Itle Mjni~l~r '0wnl,ng of"ny cMnge 01hISornar nome oraadress, 

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# CanadaI No. CF-2010-31 

### w c_ Modsum 4-901425, Fuel Feed toAPU - Replacement of Couplings in Center Wing LeftSide
- SFAR 88. This Modsum isrequired only

### onaeroplanes with the APU option (Modsum 4-302000). Approved instructions for the incorporation of Modsum 4-901425 are contained in Bombardier 5B 84-28- 05 Initial Issue, dated 28June 2006, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada. 2. Except as provided in paragraph A.2.a. and A.2.b. below, for aeroplanes that have incorporated either Modsum 4-126330 or 4-901425 prior to the effective date of this directive, carry out Fuel System LimitaLion(FSL) task 28400-417 (Functional Check of the Fuel Tank Components and Plumbing Lines for Electrical Bonding) contained in DHC-8 Series 400 Maintenance Requirements Manual. PSM 1-84-7, Part 2 "Airworthiness Limitation Items" within 6000 hours airtimeafterthe effective dateofthisdirective.
a. Aeroplanes that have successfully compleLed FSL task 28400-417 after incorporation of the above-noted Modsums do not need to comply with the requirements ofparagraph A.2. above. b. Aeroplanes that have the above-noted Modsums incorporated during manufacturing ofthe aeroplane do not need tocomply with the requirements ofparagraph A.2. above. 3. Foraeroplanes that have incorporated neither Modsums 4*126330 nor4-901425 before the effective date of this directive, carry out FSL task 28400-417 upon completion ofthe incorporation of Modsum 4-126330 and, ifapplicable, Modsum 4-901425. B. Applicable to aeroplanes SIN 4003, 4004, 4006 & 4008 through 4118 manufacturedbefore21 September2005. Within 6000 hours air time after the effective date of this directive, incorporate Modsum 4-126370, Fuel Tank System
- Enhance Protective Covering for Electrical Cable Assembly. Approved instructions for the incorporation of Modsum 4·126370 are contained in Bombardier SB 84-28-03 Revision C, dated 15 May 2009 or later revisions approved bythe Chief, Continuing Airworthiness, Transport Canada. Incorporation of Modsum 4-126370 prior to the effective date of this directive according to instructions contained in Revision Bof Bombardier SB 84-28-03 meets the requirements ofthis paragraph.


## c. Applicable to aeroplanes SIN 4003, 4004, 4006 & 4008 through 4118 manufacturedon orafter21 September2005. Within 12 000 hours air time after the effective date of this directive, incorporate Modsum 4-126370, Fuel Tank System
- Enhance Protective Covering for Electrical Cable Assembly. Approved instructions for the incorporation of Modsum 4-126370 are contained in Bombardier SB 84-28-03 Revision C, dated 15 May 2009 or later revisions approved bythe Chief, Continuing Airworthiness, Transport Canada. Incorporation of Modsum 4-126370 prior to the effective date of this directive according to instructions contained in Revision Bof Bombardier SB 84-28-03 meets the requirements ofthis paragraph.

# INo CF-2010-31 w D. Applicable toaeroplanes SIN 4119through 4205. Within 6000 hours air time after the effective date of this directive, incorporate Modsum 4-113580, Electrical System ~Fuel, High Level Sensor
- Sealant Application on Sensor Terminal Screws. Approved instructions for the incorporation of Modsum 4-113580 are contained in Bombardier S8 84-28-07 Initial Issue, dated 1 August 2008 or later revisions approved by the Chief. Continuing AilWorthiness, Transport Canada. Authorization: For Minister of Transport, infrastructure and Communities

ORIGINAL SIGNED BY Robin Laufor Derek Ferguson Chief, Continuing Airworthiness Contact: Mr. Philip Tang, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile

613-996-9178 ore-mail CAWWEBFeedback@tc.gc,ca oranyTransport Canada Centre.