2-Minute Tuesday Let's CFI faster Issue 27

How Usage Affects Memory & Forgetting FI.I.B.K14

Source AIH Chapter 3Sent Read time 2 min read

Why This Matters

Last week was how information gets in. This week is why some of it comes back when your student needs it, and some of it doesn't.

Forgetting usually isn't erasure. The information is still in long-term memory; your student just can't retrieve it. That changes your job: often you're not re-teaching from zero, you're rebuilding the path to what's already there. The exception is when it never really stuck in the first place - and part of your job is telling the difference.

What Makes Knowledge Retrievable: Frequency & Recency

Whether a student can retrieve something depends on two things:

  • Frequency: How often they've used it

  • Recency: How recently they've used it

Three combinations:

  • Frequency + Recency: Used often and recently. Retrieved easily and quickly. The goal for anything safety-critical.

  • Frequency Only: Used a lot before, but not lately. Vulnerable; slow to come back. Fix: some rehearsal to refresh it.

  • Recency Only: Recently learned but never built up. Especially fragile - the brain treats it like throwaway info, the way you'd discard an hourly weather broadcast.
    Fix: regular, spaced rehearsal to build frequency.

CFI Takeaway: A maneuver your student "knew" last lesson won't stick if it was learned once and never repeated. Newly learned skills need spaced repetition to survive, not a single good performance.

Memory Usage & Forgetting

Retrieval depends on two factors: Frequency & Recency Frequency; Recency; Result; Example High; High; Easy, quick retrieval; Current, active pilot High; Low; Slow retrieval, needs refresh; Lapsed pilot returning Low; High; Vulnerable to forgetting; Just-learned skill Low; Low; Difficult or impossible; Forgotten training The Laws of Learning Connection: Frequency = Law of Exercise (practice strengthens, disuse weakens) Recency = Law of Recency (recently learned = best remembered)
This slide is from Lesson I.B.7 on backseatpilot.app

Why Memory Fails: The Four Theories

Forgetting is usually a retrieval failure - the information is still in long-term memory; the student just can't get to it. Four theories explain why. The mnemonic is FIRRS:

  • Fading: Unused information decays over time. It may not be gone, though - hypnosis can recover "faded" memories, which suggests it's often still in there (AIH).

  • Interference: Similar material gets in the way. Two close procedures bleed together. Similar material interferes most; poorly-learned material suffers worst.

  • Retrieval Failure: The tip-of-the-tongue problem: they know it but quite reach it. Sometimes the info was never encoded well enough to store ("failure to store").

  • Repression / Suppression: A memory pushed out of reach to avoid the feelings attached to it. Repression is unconscious; suppression is deliberate.

Why We Forget (FIRRS)

Forgetting is not always bad—it keeps new information up to date. But understanding why it happens helps prevent unwanted forgetting: Theory; What happens; Prevention strategy Fading; Unused information decays over time; Regular practice and review Interference; New learning overshadows old; Ensure thorough initial learning Retrieval Failure; Information exists but can't be accessed; Create strong encoding with associations Repression & Suppression; Painful memories are pushed away; Create positive learning experiences
This slide is from Lesson I.B.7 on backseatpilot.app

What This Looks Like

Your student keeps mixing up soft-field and short-field takeoff procedures - pulling a step from one into the other.

  • The diagnosis: Interference. The two procedures are similar, so they bleed together, and since poorly-learned material suffers interference worst, neither one is solidly encoded yet.

  • The wrong fix: Drilling both back-to-back in the same session. That can reinforce the confusion.

  • The right fix: Separate them. Teach each to solid, meaningful understanding on its own - why soft-field keeps weight off the nosewheel, why short-field prioritizes precise speed and braking. Make each procedure distinct and anchored, so they stop overwriting each other.

Checkride Q&A

DPE Might Ask

"Two students each forget a maneuver. One learned it solidly months ago but hasn't flown it since. The other "learned" it by rote just last week. Same problem, or different? How do you handle each? "

Weak Answer

"Both forgot the maneuver, so both need the same thing - more practice. I'd take each of them up and drill it until they've got it back."

Why this fails

Treats two different situations as one. The students forgot for different reasons, and "just drill it" doesn't address why the second student's knowledge never stuck.

Strong Answer

"Different problems. The first is frequency-only. It was used a lot in the past, but not recently. The skill is still there; it just needs some rehearsal to refresh it, and it comes back quickly. The second is recency-only. It was learned once, recently, but never built up. That's the most fragile kind, and one re-drilling won't fix it, because it was never repeated enough to stick. For them I'd re-teach it meaningfully, connect it to what they already know, and build in spaced repetition over the next several lessons so it develops frequency."

The mock checkride on backseatpilot.app asks questions like this across every element in Task I.B.

Nate is a CFI, CFII, and MEI, former USAF C-17 Instructor Pilot, and current airline pilot with 8,500+ flight hours. He writes 2-Minute Tuesday to make CFI checkride prep clearer, simpler, and more logical, one ACS element at a time.

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