Cessna 182 Skylane (Analog) — Instrument Checkride Guide

What IFR-relevant systems does the analog Cessna 182 have?

The analog Cessna 182 relies on an engine-driven vacuum pump to power its attitude indicator (AI) and heading indicator (DI). These are the two primary gyroscopic instruments used for pitch, bank, and heading reference during IMC flight. Because both instruments draw from the same vacuum source, a single vacuum pump failure in IMC removes both simultaneously — an emergency that requires immediate recognition and transition to partial-panel techniques.

The pitot-static system drives the airspeed indicator, altimeter, and vertical speed indicator. These instruments are independent of the vacuum system and remain operational during a vacuum failure, which is why partial-panel flight is possible at all. Pitot heat is required for flight in visible moisture or icing conditions per 14 CFR 91.205(d) , and applicants must know how to verify pitot heat operation during preflight.

The electrical system powers the turn coordinator, the audio panel, navigation radios, transponder, and lighting systems. Unlike the AI and DI, the turn coordinator is electrically driven — it remains the primary bank reference during a vacuum failure, alongside the magnetic compass for heading.

• Vacuum system: powers attitude indicator and heading indicator — single-point failure risk
• Pitot-static system: independent of vacuum; powers airspeed, altimeter, and VSI
• Electrical system: powers turn coordinator, radios, transponder, and lighting
• Turn coordinator: electrically driven — survives vacuum failure; primary bank reference on partial panel
• Pitot heat: required in visible moisture; verify operation during preflight per 14 CFR 91.205(d)

What avionics suites are commonly found in the analog Cessna 182?

Analog C182 panels vary considerably by model year and prior avionics upgrades. The most common IFR-capable configuration pairs a Garmin GNS 430 or GNS 530 GPS/nav/com unit with traditional round-gauge steam instruments. Many aircraft have been upgraded to a Garmin GTN 650 or GTN 750 touchscreen navigator. The audio panel is typically a Garmin GMA 340 or GMA 345; the transponder is commonly a Garmin GTX 327 (non-ADSB) or GTX 335R (ADS-B Out).

The specific avionics installed determine which approaches are authorized for your aircraft. A GNS 430W or GNS 530W (WAAS-capable) or a GTN unit supports LPV approaches with decision altitudes comparable to a Category I ILS. A non-WAAS GNS 430 or 530 supports only LNAV approaches and enroute GPS, not LPV. You must know exactly what your aircraft is equipped with and what the AFM supplement authorizes.

What happens during a vacuum system failure in the Cessna 182?

A vacuum system failure in IMC is one of the most tested emergency scenarios in the instrument oral exam. In the analog C182, vacuum failure removes both the attitude indicator and the heading indicator simultaneously. The vacuum gauge (suction gauge) on the instrument panel will show zero or sub-normal suction; the AI may slowly tumble or erect erroneously before fully failing.

The partial-panel response — described in detail in the FAA Instrument Flying Handbook (FAA-H-8083-15B) — requires the pilot to revert to the turn coordinator for bank control, the magnetic compass for heading (with deviation corrections applied), and the pitot-static instruments for pitch, altitude, and airspeed. Partial-panel flight demands a higher instrument crosscheck rate and greater cognitive workload because each instrument provides less information than the full panel.

• Vacuum failure indication: suction gauge drops to zero; AI and DI become unreliable
• Partial-panel primary bank reference: turn coordinator (electrically driven)
• Partial-panel heading reference: magnetic compass (apply deviation and northerly/southerly turning errors)
• Pitch control: airspeed indicator, altimeter, and VSI remain fully operational
• DPE expectation: identify the failure, declare partial panel, demonstrate controlled flight and a partial-panel approach

How does the Cessna 182 fuel system differ from the Cessna 172?

The Cessna 182 carries significantly more usable fuel than the C172, enabling longer IFR legs before needing to land for fuel — an operationally meaningful difference when planning to an alternate under 14 CFR 91.167 , which requires fuel to reach the destination, then the alternate, plus 45 minutes reserve at normal cruise for IFR flight. Fuel quantities specific to your aircraft are listed in your POH — do not cite numbers from memory on a checkride.

The fuel system uses wing tanks selected via a fuel selector. The C182 fuel selector positions are typically BOTH, LEFT, and RIGHT. Operating on BOTH for takeoff and landing is standard procedure in most model years. The DPE will ask you to describe your specific aircraft's fuel selector positions and any restrictions on single-tank operation from the POH.

Most C182 variants since the 1970s are powered by a fuel-injected Continental IO-540 (or related series) engine rather than the carbureted O-300 found in earlier Skylanes. Fuel-injected engines have no carburetor icing concern — but they require understanding of hot-start procedures. When the engine is warm, residual heat can vaporize fuel in the injection lines, causing vapor lock. The hot-start procedure clears the lines before cranking; exact steps are model-specific and must come from your POH.

What do DPE oral questions for the Cessna 182 focus on?

DPEs examining C182 applicants probe the same core instrument knowledge as any IFR oral, but several topics come up specifically because of how the C182 differs from the more common C172. Prepare direct answers to the following question types under ACS task area II (aircraft systems) :

• "Your AI and DI both fail in IMC. Walk me through your partial-panel response."
• "What is the suction gauge reading that indicates your vacuum system is operating normally?"
• "Your engine just started and it took several attempts — you suspected vapor lock. What is happening in the fuel-injected system, and what procedure addresses it?"
• "How do you determine the usable fuel quantity for IFR flight planning in this aircraft?"
• "You're planning an IFR flight that requires a filed alternate. Walk me through the fuel requirements under 91.167."
• "Your C182 is not equipped with a WAAS GPS. What approaches can you fly with the installed GPS?"
• "Describe the IFR instrument requirements under 91.205(d) and identify where each is in your aircraft."
• "How does the electrical system relate to your turn coordinator — would it survive a vacuum failure?"

For all system questions, trace the failure through the specific system hierarchy in your aircraft. Generic answers are unsatisfactory — the DPE wants to hear you reason through the specific equipment installed, not recite a memorized list.

What VOR and database currency requirements apply to the analog Cessna 182?

The same IFR currency requirements that apply to all civil aircraft under 14 CFR Part 91 apply to the C182. Before any IFR flight using VOR for navigation, the VOR receivers must be checked within the preceding 30 days per 14 CFR 91.171 . The check must be logged with the date, place, bearing error, and pilot signature. Maximum allowable error is ±4 degrees at a ground checkpoint or certified test signal, ±6 degrees at an airborne checkpoint.

For GPS approaches, the navigation database must be current for the approach to be authorized. The FAA AIRAC cycle updates every 28 days; an expired database means GPS approaches are not authorized. For enroute GPS use only, an expired database may be acceptable if the procedures can be verified as unchanged — but confirm the specific AFM supplement requirements for your installed unit.

Practice Questions

Frequently Asked Questions

Q: Does the analog Cessna 182 have a vacuum system?

Yes. Most analog Cessna 182 models use an engine-driven vacuum pump to power the attitude indicator and heading indicator. A vacuum system failure in IMC removes both primary gyroscopic instruments simultaneously, requiring immediate transition to partial-panel techniques using the turn coordinator, airspeed indicator, altimeter, and VSI.

Q: What type of fuel system does the Cessna 182 use?

Most Cessna 182 models are powered by a Continental or Lycoming engine with fuel injection (IO-540 or IO-360 series), though some earlier models used carbureted engines. The fuel-injected Skylane has no carburetor heat control but requires specific hot-start procedures due to vapor lock susceptibility in the fuel-injected system.

Q: How does the Cessna 182 fuel system differ from the Cessna 172?

The Cessna 182 carries significantly more usable fuel than the C172 across its wing tanks, supporting longer IFR legs. Fuel must be selected to BOTH for takeoff and landing; unlike some aircraft, the C182 does not have individual left/right tank balance limitations beyond those in the POH. Confirm usable fuel and unusable fuel quantities from your specific aircraft's POH.

Q: Is a VOR check required before an IFR flight in the Cessna 182?

Yes. Under 14 CFR 91.171 , any VOR used for IFR navigation must be checked within the preceding 30 days. The check must be logged with the date, place, bearing error, and pilot signature. Maximum allowable error is ±4 degrees at a ground checkpoint or certified airborne test facility, ±6 degrees at an airborne checkpoint.

Q: What instruments are required for IFR flight in the analog Cessna 182?

Under 14 CFR 91.205(d) , IFR flight requires: gyroscopic rate-of-turn indicator, slip-skid indicator, sensitive altimeter, clock with sweep-second hand or digital equivalent, generator or alternator, gyroscopic bank and pitch indicator, and gyroscopic direction indicator. The C182's vacuum system powers the AI and DI; the turn coordinator is electrically powered.

Q: How does the Cessna 182 perform compared to the Cessna 172 on instrument departures?

The Cessna 182 offers meaningfully better climb performance than the C172 due to its more powerful engine and higher gross weight capacity, which translates to a higher obstacle clearance capability on instrument departures under IFR. However, the heavier airframe means fuel burn per hour is also higher — a factor in IFR fuel planning for alternate requirements under 14 CFR 91.167 .

Q: What avionics suites are commonly found in the analog Cessna 182?

Analog C182 panels vary widely by model year. Common configurations include a Garmin GNS 430/530 or GTN 650/750 for IFR GPS, a Garmin GMA 340 or 345 audio panel, King KX-165 or KX-175 nav/com radios, and a Garmin GTX 327 or GTX 335R transponder. Specific installed equipment determines which approaches are authorized.

Q: Does the analog Cessna 182 require a hot-start procedure for the fuel-injected engine?

Yes, if equipped with a fuel-injected engine. When the engine is warm, residual heat can cause fuel to vaporize in the injection lines, making normal starting procedures ineffective. The hot-start procedure typically involves opening the throttle and mixture to clear the lines before cranking — exact steps vary by model and engine variant; always consult your specific POH.

Sources

• 14 CFR 91.205 — Instrument and Equipment Requirements
• 14 CFR 91.171 — VOR Equipment Check for IFR Operations
• 14 CFR 91.167 — Fuel Requirements for Flight in IFR Conditions
• 14 CFR 91.411 — Altimeter System and Altitude Reporting Equipment Tests
• 14 CFR 91.413 — ATC Transponder Tests and Inspections
• FAA Instrument Flying Handbook (FAA-H-8083-15B)
• FAA Airplane Flying Handbook (FAA-H-8083-3C)
• FAA Instrument Rating ACS (FAA-S-ACS-8C)

This article was researched from FAA primary sources (ACS, FAR/AIM, Instrument Flying Handbook, Airplane Flying Handbook) and citing current 14 CFR Part 91 — drafted by MockDPE. V-speeds, specific fuel quantities, and POH-referenced performance values are intentionally omitted because they vary by model year and serial number — always consult your specific aircraft's POH. Last updated: May 2026. If you spot an inaccuracy, email corrections@mockdpe.org.