100+ Free ANAC CEL Theoretical Exam (Airframe Group) Practice Questions

Pass your ANAC Aircraft Maintenance Mechanic Certification Exam - Airframe Group (CEL / RBAC 65) exam on the first try — instant access, no signup required.

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Key Facts: ANAC CEL Theoretical Exam (Airframe Group) Exam

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This bank provides 100 English-language practice questions adapted for the official ANAC Airframe Group (CEL - Célula) theoretical exam in Brazil under RBAC 65.

Sample ANAC CEL Theoretical Exam (Airframe Group) Practice Questions

Try these sample questions to test your ANAC CEL Theoretical Exam (Airframe Group) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In a semimonocoque fuselage design, which structural members primarily absorb bending loads applied to the aircraft structure?

A.Longerons and stringers

B.Formers and bulkheads

C.Skin panels alone

D.Internal acoustic insulation blankets

Explanation: In semimonocoque aircraft construction, longerons and longitudinal stringers carry the primary axial and bending loads. Formers and bulkheads maintain the fuselage shape and distribute concentrated loads, while the skin carries shear loads.

2What is the principal alloying element in 2024-T3 aluminum alloy commonly used for aircraft structural skin?

A.Copper

B.Zinc

C.Magnesium

D.Silicon

Explanation: The 2000 series aluminum alloys use copper as their primary alloying element (approximately 4.4% in 2024). The T3 temper code indicates that the alloy was solution heat-treated, cold-worked, and naturally aged.

3When laying out a sheet metal repair pattern, what is the standard minimum edge distance for structural solid shank rivets?

A.2 times the rivet shank diameter

B.4 times the rivet shank diameter

C.6 times the rivet shank diameter

D.1.5 times the rivet head thickness

Explanation: Standard aircraft sheet metal repair practice (AC 43.13-1B) specifies a minimum edge distance of 2 times the rivet shank diameter (2D) measured from the center of the rivet hole to the edge of the sheet to prevent sheet shear tear-out.

4What is the purpose of the pure aluminum cladding layer (Alclad) applied to high-strength 2024 aluminum alloy sheets?

A.To provide electrolytic corrosion protection to the high-strength core

B.To increase the overall tensile strength of the sheet metal

C.To allow fluxless high-temperature brazing of fuselage skins

D.To reduce the structural weight of the airframe skin

Explanation: Alclad consists of a high-purity aluminum surface layer (roughly 1.5% to 5% of total sheet thickness on each side) roll-bonded to the 2024 core. Pure aluminum is anodic relative to the copper-bearing core, providing galvanic corrosion protection.

5A technician is installing a single row of 1/8-inch (0.125 in) diameter rivets. If the engineering repair drawing requires a rivet pitch of 4D, what is the distance between adjacent rivet hole centers?

A.0.500 inches

B.0.250 inches

C.0.375 inches

D.0.750 inches

Explanation: Rivet pitch is the distance between centers of adjacent rivets in the same row. Calculating 4D for a 0.125-inch shank diameter yields: 4 x 0.125 in = 0.500 inches (1/2 inch).

6Calculate the setback (SB) for a 90-degree sheet metal bend where the inside bend radius (R) is 0.1875 inches and the sheet metal thickness (T) is 0.0625 inches.

A.0.2500 inches

B.0.1250 inches

C.0.3125 inches

D.0.1875 inches

Explanation: For a 90-degree bend, Setback = Radius + Thickness (SB = R + T). Substituting the values: SB = 0.1875 in + 0.0625 in = 0.2500 inches.

7Using the standard empirical formula BA = [(0.01743 x R) + (0.0078 x T)] x N, calculate the Bend Allowance (BA) for a 90-degree bend in 0.040-inch sheet metal with a 0.125-inch bend radius.

A.0.2241 inches

B.0.1965 inches

C.0.3120 inches

D.0.1550 inches

Explanation: Plugging the values into the formula: BA = [(0.01743 x 0.125) + (0.0078 x 0.040)] x 90 = [0.00217875 + 0.000312] x 90 = 0.00249075 x 90 = 0.2241675 inches (rounds to 0.2241 in).

8Which severe form of structural corrosion progresses along the grain boundaries of improperly heat-treated aluminum alloys without clear surface evidence?

A.Intergranular corrosion

B.Galvanic corrosion

C.Fretting corrosion

D.Filiform corrosion

Explanation: Intergranular corrosion develops along the grain boundaries of metal alloys due to micro-structural galvanic differences. It is frequently caused by slow quenching during heat treatment and can lead to severe exfoliation corrosion.

9What is the primary function of adding hollow glass microballoons to epoxy resin during composite structural honeycomb repairs?

A.To reduce density and create a lightweight potting compound for edge filling

B.To increase the flexural tensile modulus of outer structural laminates

C.To provide high electrical conductivity across composite lightning strike mesh

D.To accelerate the chemical curing reaction time of room-temperature epoxies

Explanation: Glass microballoons are low-density microscopic hollow spheres mixed into epoxy resin to lower its overall density and create a workable potting compound for filling honeycomb core cells and damaged panel edges.

10During vacuum bag curing of a composite repair patch, a vacuum gauge reads 25 inches of mercury (in Hg). What approximate compaction pressure does this exert on the repair laminate at sea level?

A.12.3 PSI

B.25.0 PSI

C.14.7 PSI

D.7.5 PSI

Explanation: Standard atmospheric pressure at sea level is 29.92 in Hg (14.7 PSI). A vacuum reading of 25 in Hg represents (25 / 29.92) x 14.7 PSI = 12.28 PSI (approx. 12.3 PSI) of uniform atmospheric compaction pressure.

About the ANAC CEL Theoretical Exam (Airframe Group) Exam

This practice question bank is an English-language MCQ study adaptation for the official ANAC / FGV Airframe Group (CEL - Célula) maintenance mechanic theoretical examination in Brazil under RBAC 65. The exam tests essential technical competence across aircraft structural repairs, sheet metal and composite construction, hydraulic and pneumatic power, landing gear systems, primary and secondary flight controls, cabin environmental control, fuel systems, and Brazilian civil aviation safety regulations (RBAC 65).

Assessment

Official ANAC/FGV computerized theoretical exam: 3 papers × 20 MCQ (BAS, CEL1, CEL2) unless BAS previously passed. Pass standard: 70% per subject paper. Language: Portuguese only.

Time Limit

90 minutes (30 minutes per paper; shared across papers)

Passing Score

70% per subject paper

Exam Fee

TFAC R$ 200 (duration band 30 min–2h30) (FGV (Fundação Getulio Vargas) on behalf of ANAC (Agência Nacional de Aviação Civil))

ANAC CEL Theoretical Exam (Airframe Group) Exam Content Outline

25%

Airframe Structures, Sheet Metal & Composite Repairs

Monocoque and semimonocoque fuselage design & structural loads, Aluminum alloy heat treatment, sheet metal layout & bend allowance calculations, Rivet pitch, edge distance, shear strength & flush riveting procedures, Advanced composite material layups, honeycomb core & structural repairs, Corrosion detection, surface treatment & non-destructive testing (NDT)

25%

Hydraulic, Pneumatic & Flight Control Systems

Pascal's Law hydraulic calculations: force, pressure, and piston surface area, Hydraulic fluids (MIL-H-5606 vs Skydrol), reservoir pressurization & contamination, Engine-driven pumps, pressure regulators, relief valves & hydraulic accumulators, Primary flight controls (ailerons, elevators, rudders) & secondary controls (flaps, spoilers), Control cable tension temperature compensation, turnbuckles & push-pull rod rigging

20%

Landing Gear, Brake Systems & Aircraft Steering

Air-oil (oleo-pneumatic) strut servicing, charging pressures & fluid levels, Landing gear extension/retraction mechanisms, safety locks & indicator switches, Aircraft hydraulic brake systems, single/multi-disc assemblies & brake bleeding, Anti-skid control valves, wheel speed sensors & hydroplaning protection, Nosewheel steering mechanisms, shimmy dampers & aircraft tire maintenance

15%

Cabin Environmental Systems, Fuel & Utilities

Pressurization control: outflow valves, safety relief valves & cabin pressure altitude, Air cycle machine (bootstrap) cooling & vapor-cycle air conditioning systems, High-pressure gaseous oxygen systems, safety precautions & diluter-demand regulators, Fuel system components, pumps, crossfeed manifold operation & fuel quantity indicators, Fire detection loops, continuous-loop systems & HRD fire extinguishing bottles

15%

RBAC 65 Regulations, Inspection & Weight and Balance

RBAC 65 license privileges, rating limitations & mechanic scope of authority, 100-hour and annual inspection checklists, airworthiness directives & logbook entries, Weight and balance theory: datum, arm, moment & center of gravity (CG) calculations, Empty weight CG, maximum gross weight & ballast calculation procedures, Aviation safety management, tool control & Brazilian ANAC inspection compliance

How to Pass the ANAC CEL Theoretical Exam (Airframe Group) Exam

What You Need to Know

Passing score: 70% per subject paper
Assessment: Official ANAC/FGV computerized theoretical exam: 3 papers × 20 MCQ (BAS, CEL1, CEL2) unless BAS previously passed. Pass standard: 70% per subject paper. Language: Portuguese only.
Time limit: 90 minutes (30 minutes per paper; shared across papers)
Exam fee: TFAC R$ 200 (duration band 30 min–2h30)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ANAC CEL Theoretical Exam (Airframe Group) Study Tips from Top Performers

1Master Pascal's Law formulas (F = P x A) and unit conversions between PSI, square inches, and hydraulic output forces.

2Review sheet metal layout equations, including Bend Allowance (BA), Setback (SB = R + T), and minimum rivet edge distance (2D) and pitch (3D to 8D).

3Memorize the operational differences between synthetic hydraulic fluids (Skydrol / phosphate-ester) and mineral-based fluids (MIL-H-5606 / red oil), including seal compatibilities.

4Practice center of gravity calculations using Datum, Weight, Arm, and Moment tables, including ballast additions and equipment relocation.

Frequently Asked Questions

What is the ANAC CEL examination under Brazilian regulations?

The ANAC CEL (Célula) examination is the theoretical certification test administered via FGV for aircraft maintenance technicians specializing in airframe structures, systems, hydraulics, landing gear, and environmental controls in accordance with RBAC 65.

What passing score is required for ANAC maintenance mechanic exams?

Candidates must achieve a minimum score of 70% on each subject paper to pass the theoretical examination requirement under RBAC 65.

How long is each official ANAC examination paper?

Each subject paper consists of 20 multiple-choice questions with a time limit of 30 minutes. Candidates taking a 4-paper battery have 2 hours total.

Are mathematical and structural calculations tested on the CEL exam?

Yes. Candidates are tested on practical mechanics calculations including hydraulic force and piston area (Pascal's Law), sheet metal bend setback, rivet spacing, cable tension thermal correction, and aircraft weight and balance center of gravity shifts.

Is this practice question bank available in English?

Yes. This question bank is an English-language study adaptation designed to help candidates prepare for the technical concepts, terminology, and quantitative problem-solving tested on the official ANAC/FGV CEL examination.