This is a myth. Saying “I don’t know, but I can look it up” — and then actually finding it — is an acceptable answer on a practical test, and in many cases a good one. It demonstrates two things examiners actively evaluate: honest self-assessment and resource management.
But the myth survives because the reality has a condition attached, and that condition is where applicants get into trouble. Some things you can look up. Some things you’re expected to know cold. Knowing which is which is the actual skill being tested.
Why Looking Something Up Is Acceptable
Aviation is not a memorization profession. It’s a profession built on knowing where authoritative information lives and being able to retrieve it accurately.
That’s embedded in the regulations themselves. 14 CFR 91.103 requires a pilot to become familiar with all available information concerning a flight — a standard that assumes you’ll consult sources rather than recall everything. No pilot flies a cross-country from memory.
It’s also embedded in how the Airman Certification Standards are built. The ACS integrates knowledge, risk management, and skill, and tests at the level of correlation — connecting and applying information to novel situations — rather than rote recall. A pilot who can locate a limitation in the POH and explain what it means for the flight is demonstrating exactly that.
And it reflects how the job actually works. A professional pilot encountering an unfamiliar situation consults the AFM, the regulations, the chart supplement, or a dispatcher. Nobody is impressed by a crew that guesses.
What an Examiner Is Actually Evaluating
When you say you don’t know, the examiner learns several things at once:
Whether you know your own limits. A pilot with accurate self-assessment is safer than one with false confidence. This is the foundation of the ACS risk management framework.
Whether you know where to look. This is the real test. “I don’t know” ends the conversation badly. “I don’t know, but that’s in the limitations section of the POH — let me find it” is a completely different answer.
Whether you can find it efficiently. Fumbling through the FAR/AIM for ten minutes suggests you’ve never used it. Going straight to Part 91 Subpart B suggests you have.
Whether you understand it once you find it. Reading the text aloud isn’t the answer. Explaining what it means for the flight is.
Whether you’re honest. This matters most. An examiner who catches an applicant bluffing starts questioning everything else the applicant said.
What Actually Fails Applicants
Not knowing an answer is rarely the problem. These are:
Guessing and presenting it as fact. Making something up is the single worst thing you can do. It’s a judgment failure, not a knowledge failure, and examiners treat it accordingly.
Bluffing with vague language. Talking around a question to avoid admitting you don’t know is transparent and reads worse than a direct admission.
Not knowing where to look. “I don’t know” with no follow-up is a dead end. If you can’t locate it, the resource-management point isn’t made.
Taking forever. Unfamiliarity with your own references suggests you don’t use them.
Giving an unsafe answer confidently. Confidence attached to a wrong answer about weather minimums or fuel requirements is more alarming than uncertainty.
Not knowing things you’re expected to know cold. This is the condition on the myth.
What You’re Expected to Know Without Looking
The distinction generally tracks one principle: if you’d need it immediately in flight, with no time to open a book, you’re expected to know it.
Emergency memory items. Engine failure, engine fire, emergency descent — whatever your POH designates as memory items. You will not be looking these up at 500 feet, and an examiner will not accept that you’d try.
Your aircraft’s V-speeds. Vx, Vy, Va, Vfe, Vno, Vne, Vs, Vso, best glide. These govern decisions in real time.
Airspace requirements. Entry requirements, equipment, and weather minimums for the airspace you fly in. You need these on the fly.
Your personal minimums. Not a regulation, but the ACS risk management framework expects you to have them and know them.
Fuel requirements. VFR day, VFR night, IFR — these drive go/no-go decisions constantly.
Basic regulations you apply every flight. Currency, medical requirements, required documents, preflight obligations.
What you briefed. If you told the examiner your plan, you’re expected to know your own plan.
What’s Reasonable to Look Up
Specific regulation citations. Knowing that an instrument proficiency check requirement exists and where to find it is more useful than reciting “61.57(d).”
Performance chart details. You should be able to work the charts. Having specific numbers memorized is not the point.
Less common limitations. Obscure equipment requirements, unusual operating limitations, seldom-encountered procedures.
Chart and publication specifics. Frequencies, approach minimums, airport data — these are published precisely so you don’t memorize them.
Anything genuinely outside normal operations for your certificate level and aircraft.
How to Answer Well
There’s a structure that works:
Acknowledge directly. “I don’t know that off the top of my head.”
Say where it is. “That’s in Section 2 of the POH” or “That’d be in Part 91, Subpart C.”
Find it. Efficiently, without narrating your struggle.
Explain what it means. Not just the text — the operational implication.
Offer what you do know. If you know the general principle but not the specific number, say so. Partial knowledge honestly stated is better than nothing or a guess.
The full version sounds like: “I don’t remember the exact figure, but that’s in the limitations section — and operationally it means I’d need to plan for a longer ground roll on a hot day. Let me pull the number.”
That answer is often better than simply reciting the number from memory, because it shows you understand why the number matters.
Preparing for This
Organize your references before the checkride. Tab your POH. Know your FAR/AIM’s structure. Have your EFB arranged so you can find a chart supplement entry in seconds.
Practice retrieval, not just recall. When studying, deliberately look things up rather than relying on notes. You’re building a skill the examiner will test.
Know the FAR/AIM’s organization. You don’t need to memorize Part 91 — you need to know roughly where things live within it.
Make a memorize-it list. Memory items, V-speeds, personal minimums, fuel requirements, airspace basics. Everything else is lookup territory.
Practice saying it out loud. “I don’t know, but I can find it” is harder to say under pressure than it looks. Rehearse it with your CFI so it’s a comfortable sentence rather than an admission.
The Bottom Line
You will not fail a practical test for not knowing an answer. You can fail for guessing, for bluffing, for not knowing where to look, or for not knowing the things that have to be immediate.
The FAA knows no pilot carries everything in their head. What’s being evaluated is how you respond when you reach the edge of what you know — whether you recognize the edge, and what you do next.
Honest, resourceful, and able to find the answer is the profile examiners want. It’s also the profile that keeps pilots alive, which is rather the point.
Frequently Asked Questions
Will I fail my checkride if I don’t know an answer on the oral exam? No. Saying “I don’t know, but I can look it up” and then locating the information in an appropriate reference is an acceptable answer that demonstrates honest self-assessment and resource management — both of which examiners evaluate. What causes problems is guessing, bluffing, being unable to find the information, or not knowing items you are expected to know immediately from memory.
What am I expected to know from memory on a checkride? Generally, anything you would need immediately in flight without time to consult a reference: emergency memory items from your POH, your aircraft’s V-speeds, airspace entry and weather requirements, fuel requirements for your operation, your personal minimums, basic regulations applied on every flight such as currency and required documents, and the details of any plan you briefed to the examiner.
What can I reasonably look up during an oral exam? Specific regulation citations, performance chart values, less common aircraft limitations, chart and publication details such as frequencies and approach minimums, and anything outside normal operations for your certificate level. You should be able to work a performance chart rather than recite values from it, and know approximately where information lives in the FAR/AIM and your POH.
How should I phrase it when I don’t know something? Acknowledge directly, state where the information is located, find it efficiently, and then explain what it means operationally rather than just reading the text. If you know the general principle but not a specific figure, say so — partial knowledge honestly stated is better than a guess. An answer that demonstrates understanding of why the information matters is often stronger than a memorized figure.
What actually causes applicants to fail the oral exam? Common causes include guessing and presenting the guess as fact, bluffing with vague language to avoid admitting uncertainty, being unable to locate information in available references, taking excessive time to find something due to unfamiliarity with references, giving confidently incorrect answers on safety-critical items such as weather minimums or fuel requirements, and not knowing information expected to be immediately available from memory.
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