Fuel tank safety training Phase 1 vs Phase 2: which do you need?

What is fuel tank safety Phase 1 vs Phase 2?

Phase 1 is awareness training for the people who manage and audit maintenance; Phase 2 is the detailed course for anyone who plans, performs, supervises, inspects or certifies maintenance on the affected large aeroplanes and their fuel system components. Phase 2 adds a multiple-choice examination at 75% and repeats in each 2-year period.

Both phases come from one document: Appendix IV to AMC5 145.A.30(e) and AMC2 145.B.200(a)(3) in the EASA Easy Access Rules for Continuing Airworthiness, with a Part-M twin for CAMOs. This guide follows it paragraph by paragraph.

Does fuel tank safety training apply to your fleet at all?

Paragraph A sets the effectivity, and it is narrower than many people assume:

“Large aeroplanes as defined in […] (CS-25) and certified after 1 January 1958 with a maximum type certified passenger capacity of 30 or more or a maximum certified payload capacity of 7500 lbs (3402 kg) cargo or more, and […] Large aeroplanes […] which contains CS-25 amendment 1 or later in their certification basis.” — Appendix IV, paragraph A

Paragraph B names the affected organisations: Part-145 organisations maintaining those aeroplanes, and fuel system components installed on them where the maintenance data are affected by a CDCCL, plus the authorities that oversee them. If nothing in your scope touches an aeroplane in paragraph A and no component you maintain carries CDCCL-affected data, the appendix does not bite. Where it does, paragraph C sets the training population, and it reaches well beyond the hangar floor.

Who needs Phase 1 only?

Paragraph C splits the population in two. The first group receives Phase 1 and nothing further:

“Phase 1 only: The group of persons representing the maintenance management structure of the organisation, the compliance monitoring manager, the safety manager and the staff who are directly involved in monitoring the compliance of the organisation. Personnel of the competent authorities who are responsible for the oversight of Part-145 approved maintenance organisations specified in paragraph B).” — Appendix IV, paragraph C

They need to recognise a CDCCL item and audit the people doing the work, not do the work themselves. Paragraph D sets the timing:

“The training should be carried out before the person starts to work without supervision but not later than 6 months after joining the organisation.” — Appendix IV, Phase 1 – Awareness

Phase 1 is deliberately light in form: awareness of the principal elements of the subject, which may take the form of a training bulletin or any other self-study or informative session, with the signature of the trainer required to confirm the person has passed. Its objectives stop at familiarisation, and its content list runs to six items, from a background of accidents and incidents and the concept of CDCCL to typical defects and maintenance instructions for inspection.

Who needs Phase 2?

The second half of paragraph C:

“Phase 1 + Phase 2 + recurrent training: Personnel of the Part-145 approved maintenance organisation who are required to plan, perform, supervise, inspect and certify the maintenance of the aircraft and fuel system components specified in paragraph A).” — Appendix IV, paragraph C

Five verbs, each pulling in different job titles: planners, mechanics and technicians, supervisors, inspectors, certifying and support staff. A planner who never opens a tank is in scope, because planning is where a CDCCL task is preserved or lost.

Note the order: Phase 1 + Phase 2, then the 2-year cycle. Most organisations cover the Phase 1 objectives inside the Phase 2 course itself, but the record should show both. The Phase 2 deadline is partly historical: staff should have received the training by 31 December 2010 or within 12 months of joining, whichever comes later. For anyone hired today that means 12 months from joining, so the practical sequence is Phase 1 at induction and Phase 2 inside the first year.

What must a Phase 2 course contain?

Paragraph E gives three guidelines: understanding of the background and concept of fuel tank safety; how mechanics recognise, interpret and handle the improvements made to the instructions for continuing airworthiness on fuel tank system maintenance; and awareness of hazards on the fuel system, particularly where a nitrogen Flammability Reduction System is fitted. Those three are introduced through eight issues:

1. The theoretical background to the risk — fuel and air mixtures, temperature and pressure, ignition energy, the fire triangle, and the two ways to prevent explosions: ignition source prevention and flammability reduction.
2. Major accidents related to fuel tank systems, their investigations and conclusions.
3. SFAR 88 of the FAA and JAA Interim Policy INT POL 25/12: ignition prevention goals, identifying and correcting unsafe conditions.
4. What followed: modifications, airworthiness limitation items and CDCCL.
5. Where the information sits and how to interpret it in the maintenance data defined in 145.A.45(b).
6. Fuel tank safety in maintenance: tank entry and exit, a clean working environment, configuration control, wire separation, bonding.
7. Flammability reduction systems: why they are fitted, their effects, the hazards of nitrogen, the precautions.
8. Recording maintenance actions, measures and inspection results.

It should also include a representative number of examples of defects and the associated repairs from the TC and STC holders’ maintenance data. The appendix then fixes the character of the course:

“Type: It should be a more in-depth internal or external course. It should not take the form of a training bulletin, or any other self-study. At the end of the course, the trainees should be required to take an examination, which should be in the form of multiple-choice questions, and the pass mark of the examination should be 75%.” — Appendix IV, Phase 2 – Detailed training

Duration is guidance, not a rule: 8 hours for Phase 2 is an acceptable compliance. In a classroom, the instructor should be very familiar with the objectives and guidelines, having attended a similar classroom course themselves.

How often is continuation training due?

In each 2-year period, and only for the Phase 2 population:

“Recurrent training: The organisation should ensure that the recurrent training is required in each 2-year period. The syllabus of the training programme referred to in Chapter 3.9 of the maintenance organisation exposition (MOE) should include the additional syllabus for this recurrent training.” — Appendix IV, Phase 2 – Detailed training

Three consequences follow. The Phase 1 only population carries no 2-year fuel tank safety cycle under this appendix; its repeating obligation is the safety training under AMC4 145.A.30(e), a different subject on a different record. The continuation syllabus has to be written into MOE chapter 3.9. And the appendix lets continuation training be combined with Phase 2 training, in a classroom or at a distance, and says it should be updated when new instructions are issued on the material, tools, documentation or directives.

“In each 2-year period” is a rolling window, not a fixed anniversary, so anchor it: take the date of the last course and complete the next before that date plus 24 months. The continuation due-date tool does that arithmetic. Keep the fuel tank safety date separate from the human factors date; the two cycles run independently.

Can Phase 2 be done online?

Yes, under conditions the appendix states. Phase 2 may run in appropriate facilities containing examples of the components, systems and parts affected, or as a distance course — e-learning or computer-based training — that meets four criteria:

“A continuous evaluation process should ensure the effectiveness of the training and its relevance; Some questions at intermediate steps of the training should be proposed to ensure that the trainee is authorized to move to the next step; The content and results of examinations should be recorded; Access to an instructor in person or at distance should be possible in case support is needed.” — Appendix IV, Phase 2 – Detailed training

Those four are the test to apply to any online Phase 2 product, and a recorded video with a certificate button at the end fails at least three of them. Note the asymmetry: Phase 1 may be self-study, while Phase 2 may be at a distance but never self-study. Our guide on whether online training is accepted answers the same question for human factors and EWIS. Paragraph F closes the loop: the training programme and the examination content are approved through the change to the MOE.

Which phase does each role need?

Role	Phase 1	Phase 2	2-year cycle	Format
Maintenance management, compliance monitoring manager and staff, safety manager	Before unsupervised work, ≤ 6 months after joining	No	No	Bulletin, self-study or informative session, signed by the trainer
Competent authority oversight personnel	Yes, paragraph C	No	No	As above
Planners, mechanics and technicians on affected maintenance	Same timing	Within 12 months of joining	Each 2-year period	In-depth internal or external course, classroom or distance; multiple-choice exam at 75%
Supervisors, inspectors, certifying and support staff	Same timing	Within 12 months of joining	Each 2-year period	As above

“No” means not required by Appendix IV. Anyone in the top rows who also plans, performs, supervises, inspects or certifies affected maintenance joins the Phase 2 population — paragraph C defines it by the work, not the job title.

Does a CAMO follow the same appendix?

Almost. The Part-M text is Appendix XII to AMC M.A.706(f) and AMC1 M.B.102(c); the effectivity, two-phase structure, 75% pass mark, e-learning criteria and 8-hour acceptable duration are identical. Three things differ. The Phase 1 only group is, in the words Part-M still uses, “the quality manager and quality personnel”, plus authority staff overseeing under M.B.704. The Phase 1 + Phase 2 group is CAMO personnel involved in the management and review of the continuing airworthiness of the affected aircraft. And the syllabus lives in the training policy of the CAME, changed under M.A.704(b) rather than in MOE chapter 3.9.

The UK position is the same in substance: SI 2023/588 carried the EU wording of 145.A.30(e) into UK Part-145 with the CAA as competent authority. UK AMC and GM sit in the CAA’s registration-gated library, so this guide quotes EASA text only.

Related courses. MOST.AERO does not yet run a fuel tank safety course: Aircraft Fuel Tank Safety Phase 2 – Initial and Aircraft Fuel Tank Safety Phase 2 – Continuation are coming soon, and we will tell you when they go live. Meanwhile the continuation due-date tool tracks the 2-year cycle, and Part-145 Safety Training including Human Factors — Initial covers the separate safety training obligation the same staff carry.