Beechcraft Baron 58 (Analog) — Multi-Engine Instrument Guide

What IFR-relevant systems does the Baron 58 have?

The Baron 58 is a twin-engine, retractable-gear aircraft with two fuel-injected Continental IO-550 engines. Its IFR-relevant systems are notably more redundant than those of any single-engine aircraft, and that redundancy is itself a DPE topic — you must know which backup exists for each primary system, what triggers the backup, and what failure mode remains even with the backup in place.

Dual vacuum pumps. Each engine drives its own vacuum pump, supplying suction to the attitude indicator (AI) and heading indicator (HI) on its respective side. A single vacuum pump failure — common in single-engine aircraft and the cause of numerous fatal accidents in IMC — does not immediately deprive the Baron 58 of AI or HI, provided the crossover valve or secondary vacuum source is functional. The DPE will ask you to trace exactly what happens in a single-pump failure and whether the gyros are truly protected.

Dual alternators and dual electrical buses. Each engine drives an alternator. Most configurations distribute avionics and instruments across two buses so that a single alternator failure does not black out the aircraft. Know your specific aircraft's bus architecture from the POH — which radio is on which bus, and what load-shedding is required after a single alternator failure.

Separate fuel systems per engine. Each engine has its own fuel supply. A crossfeed valve allows one engine to draw from the opposite side's tanks in an emergency. Mismanaging crossfeed — or leaving it open when it should be closed — is a recurring cause of multi-engine fuel exhaustion accidents.

• Dual engine-driven vacuum pumps — each engine supplies its own vacuum circuit; single pump failure does not immediately disable all gyros
• Dual alternators — each engine charges its own bus; know the load-shedding sequence for single-alternator ops
• Separate fuel systems with crossfeed — each engine draws from its own tanks; crossfeed is for emergency only unless the POH specifies otherwise
• Retractable gear and variable-pitch propellers — complex aircraft per 14 CFR 61.31(e); prop control is critical in OEI configuration
• Conventional analog six-pack — AI and HI are vacuum-driven; turn coordinator is electrically driven; pitot-static instruments are independent

What endorsements are required to fly the Baron 58 IFR?

Three separate regulatory endorsements apply to the Baron 58 before you can act as PIC under IFR. Per 14 CFR 61.31 , each endorsement has a specific training and logbook-entry requirement:

The DPE will verify all three endorsements are in your logbook before the checkride begins. Failing to produce any one of them is a no-go. The complex and high-performance endorsements are separate entries — having one does not satisfy the other.

What is the critical engine concept, and why does it apply to the Baron 58?

The Baron 58 has a critical engine because both engines rotate in the same direction — clockwise when viewed from the cockpit. Per FAA-H-8083-3C, Chapter 13 , when both props rotate clockwise, the same aerodynamic forces act on both engines, but their effect on directional control after failure is not equal. The engine whose failure causes the greatest yaw moment is the critical engine.

The four forces that determine which engine is critical are summarized with the memory aid P-A-S-T per FAA-H-8083-3C:

The combined effect of these four forces means that losing the left engine creates a larger yawing moment and more adverse control forces than losing the right engine in a conventional-rotation twin like the Baron 58. The DPE will ask you to explain which engine is critical and why — citing at least the P-factor component of P-A-S-T is the minimum expected answer.

This is the key distinction from the Piper Seminole and Diamond DA42. Those aircraft use counter-rotating props — one engine turns clockwise and the other counterclockwise — so the P-A-S-T forces largely cancel out and neither engine is critical. The Baron 58 has no such symmetry. This fact is worth understanding before stepping into the oral exam.

What V-speed concepts govern OEI operations?

Three V-speeds define the control and performance envelope for single-engine operations. Per FAA-H-8083-3C Chapter 13 , all three are aircraft-specific — do not apply generic numbers from any training material, including this page. Consult your Baron 58's POH for actual values.

• Vmc — Minimum controllable airspeed with the critical engine inoperative and the operating engine at full power. Published under standardized conditions per the AFM. Flying below Vmc after the critical engine fails risks loss of directional control.
• Vyse — Best single-engine rate-of-climb airspeed; marked with a blue arc or line on the airspeed indicator. This is your target airspeed on any OEI missed approach — it maximizes climb performance (or minimizes descent rate) on one engine.
• Vsse — Minimum speed for intentional engine failure during training. Exists to ensure an adequate margin above Vmc before a training engine is deliberately failed. Never reduce below Vsse when simulating an engine failure with a CFI.

On an OEI approach and missed approach in the Baron 58, maintaining Vyse is the single most important airspeed task. Letting airspeed decay below Vyse toward Vmc while flying in IMC is the scenario that ends careers and flights. The DPE will monitor airspeed management throughout the OEI scenario.

How do you manage an OEI instrument approach in the Baron 58?

OEI instrument approach management in the Baron 58 follows the same conceptual sequence covered in ACS Task IR.VII.B , but with Baron-specific systems considerations layered on top. The DPE will evaluate your execution of this sequence:

1. 1
   Maintain aircraft control — full rudder toward the operative engine, wings level, establish bank toward the operative engine as needed to reduce rudder force. Control before checklist.
2. 2
   Identify — 'dead foot, dead engine.' The rudder foot pressing to maintain directional control identifies which engine has failed. Confirm before feathering.
3. 3
   Verify — briefly reduce power on the suspected operative engine to confirm the failed engine is truly failed. This step prevents feathering the wrong engine.
4. 4
   Feather and secure — per the POH emergency checklist memory items, feather the failed engine's propeller. A feathered prop produces dramatically less drag than a windmilling prop and is essential to performance on the missed approach.
5. 5
   Establish Vyse — fly the blue line. This is your performance target for the remainder of the approach.
6. 6
   Complete the checklist — use the POH engine-out securing checklist to complete all remaining steps. Fuel selector, mixture, magnetos, alternator, crossfeed — each item per your specific aircraft's checklist.
7. 7
   Brief the missed approach for OEI — know your single-engine climb performance and whether the published missed approach procedure is achievable with one engine secured.
8. 8
   Execute the approach — maintain Vyse, manage the asymmetric workload, apply 14 CFR 91.175(c) rules at DA or MDA.
9. 9
   At minimums — do not descend below DA/MDA unless the runway environment is in sight and you can make a normal landing. An OEI situation does not waive the requirements of 14 CFR 91.175(c).
10. 10
    On missed approach — full power on the operative engine, retract gear, retract flaps per POH, maintain Vyse, declare emergency with ATC, advise intentions.

What are the common DPE oral questions for the Baron 58?

DPEs testing Baron 58 applicants consistently focus on critical engine identification, system redundancy, and fuel management — topics that distinguish the Baron from lighter multi-engine trainers. These questions are derived from the Instrument Rating ACS (FAA-S-ACS-8C) knowledge elements under Areas II (Preflight), VII (Emergency Operations):

• "Which engine is the critical engine on this airplane, and walk me through the P-A-S-T factors to prove it." (The defining Baron 58 oral question — know it cold)
• "You lose an engine after entering the clouds. Walk me through your identification and verification procedure before you feather. Why does the order matter?" (Feathering the wrong engine in IMC is fatal)
• "Your left alternator fails in IMC. What does that do to your electrical buses, and what do you load-shed first?" (Tests bus architecture knowledge — answer from your specific aircraft's POH)
• "Both engines have vacuum pumps. Your right engine fails and you feather it. What happens to your AI and HI?" (Tests dual-vacuum architecture — the remaining left pump should still supply both gyros, but verify per your aircraft)
• "At what point does crossfeed become appropriate after an engine failure?" (Fuel management — POH-specific; frame the answer as a POH-driven decision, not a generic rule)
• "Walk me through the gear-up call on an OEI missed approach. When do you raise it, and is there any case where you would not?" (Complex aircraft gear management in an asymmetric emergency)
• "Your single-engine service ceiling is 7,200 feet and you're filed at 8,000. You lose an engine. What do you do?" (Tests drift-down concept from FAA-H-8083-3C Ch. 13)

Practice Questions

Frequently Asked Questions

This article was researched from FAA primary sources (FAA-H-8083-3C Airplane Flying Handbook, ACS FAA-S-ACS-8C, 14 CFR Parts 61 and 91) by MockDPE. V-speeds (Vmc, Vyse, Vsse), fuel system specifics, bus architecture, and single-engine ceiling are Baron 58 POH data — consult your specific aircraft's POH and AFM supplements for all actual values. Last updated: May 2026. If you spot an inaccuracy, email corrections@mockdpe.org.