FAA Private Pilot - Glider (PGL) common mistakes
FAA Private Pilot - Glider (PGL) · Understand the traps and how to avoid them.
Computing weight and balance using only the glider's empty weight and pilot weight, then declaring the flight legal without checking the forward and aft CG limits against the published envelope.
Candidates memorize the empty weight and max gross weight numbers from the POH but treat the CG envelope as a formality, and glider loading is unusually sensitive because ballast, parachute, and battery placement shift CG far more than in a spam-can. Many also forget that the tailwheel or CG hook geometry means the empty CG is often near the aft limit already.
What to do instead
Before every practice problem, draw the envelope and plot three points: minimum pilot weight, maximum pilot weight, and maximum pilot weight with ballast. Compute moments in the same units the POH uses (inches from datum, not arm guessing) and verify each point falls inside the envelope. Practice one full problem per study session until plotting takes under five minutes.
Answering airspace and cloud-clearance questions using VFR minimums for airplanes instead of the glider-specific exceptions, and missing that gliders may operate under Class G and Class E with different visibility and cloud distances than powered aircraft.
Most study material is written for airplane applicants, and the glider exceptions (such as operating above 10,000 MSL, in Class G during the day, and the cloud-clearance relief in some cases) are buried in the regs. Candidates skim 14 CFR 91.155 and 91.215 and assume the airplane table applies.
What to do instead
Build a one-page table of 14 CFR 91.155 and 91.215 entries that explicitly apply to gliders, marking each cell with the source paragraph. Recite the glider-specific rows aloud until you can state them without the table, then re-check against the current regulation text before the checkride.
Treating the airspeed indicator as the primary energy instrument during thermalling and approach, and failing to recognize when the ASI is reading low due to a blocked pitot or high due to a blocked static source.
Glider candidates train heavily on visual and audio cues (yaw string, variometer, sight picture) and under-practice instrument interpretation. Because glider ASIs are simple and often unheated, pitot icing and insect blockage are realistic, and candidates do not rehearse the symptoms.
What to do instead
Memorize the two failure signatures: blocked pitot with static open reads zero or decreasing with altitude; blocked static reads high and climbs as you descend. Practice a simulated blocked-static approach using the altimeter and sight picture only, and know the alternate static or canopy vent procedure for your type.
Planning cross-country glider flights with only a wind aloft forecast and no calculation of glide ratio margin, final glide height, or the effect of sinking air on the return leg.
Candidates conflate powered cross-country planning (fuel and time) with glider planning (energy and altitude), and they underestimate how a 10-knot headwind or a 200 fpm sink band changes the achievable glide. Many also plan to a destination without a committed landout field and a decision altitude.
What to do instead
For every practice cross-country, compute the still-air glide distance for the type, subtract a 25 percent safety margin, then recompute with the forecast headwind and with 2 knots of sink. Write a decision altitude for each leg and a named landout field with its elevation and surface. Do this on paper for three routes before the checkride.
Explaining thermalling and ridge lift qualitatively ("find the thermal, circle in it") without being able to state turn direction, bank angle, entry and centering technique, and the effect of wind drift on thermal position.
Candidates read soaring theory but never convert it into a checklist they can verbalize. Examiners ask for the specific behavior, and vague answers signal book knowledge without understanding, especially about drift and the need to re-center after each turn.
What to do instead
Write a 10-step thermalling procedure: entry heading, bank angle, airspeed, variometer interpretation, drift correction, re-centering rule, and exit criteria. Rehearse it aloud until you can deliver it in under two minutes, then fly it with an instructor and note where your verbal version diverges from reality.
Confusing the aerotow and winch launch emergency procedures: giving the wrong signal, delaying the decision, or attempting a turn back to the runway below a safe altitude.
Both launch types share the word "emergency" but have different failure modes and different correct responses. Candidates memorize one and apply it to the other, and the turn-back temptation is strong because the runway looks close.
What to do instead
Build a two-column card: aerotow (release on rope break below 200 feet AGL, land ahead; above that, evaluate the pattern) versus winch (release immediately on power failure, lower the nose, land ahead; never turn back below 200 feet). Memorize the rope-break signals and the abort signal. Rehearse both as chair flights with an instructor before solo.
Answering human-factors and ADM questions with the textbook definition of a hazardous attitude instead of identifying the specific hazardous attitude in the scenario and the corresponding antidote.
Candidates study the five hazardous attitudes as a list and then fail to map a scenario to one of them, or they pick the antidote for the wrong attitude. Glider scenarios add pressure because the decision window is short and the landout option feels like failure.
What to do instead
Practice 20 short scenarios and force yourself to name one attitude and one antidote per scenario in a single sentence. Use the standard antidote pairs (anti-authority to follow the rules, impulsivity to not so fast, invulnerability to it could happen to me, macho to taking chances is foolish, resignation to I am not helpless). Time yourself at 15 seconds per scenario.
Skipping the preflight inspection of glider-specific systems: the CG hook, tow release, spoiler or dive brake rigging, and the total energy tube or variometer connections.
Candidates transfer airplane preflight habits and check the obvious surfaces but not the systems unique to gliders. The CG hook and release are safety-critical and rarely exercised on the ground, so familiarity breeds skipping, and the total energy probe is easy to leave capped or disconnected.
What to do instead
Write a type-specific preflight checklist that includes a functional check of the tow release (with a helper pulling tension), CG hook condition and latch, spoiler full travel and positive lock, and the total energy probe free of tape or obstruction. Fly the checklist once with an instructor who signs it off, then use it verbatim every time.
Using the wrong radio phraseology and frequencies for glider operations, including failing to announce position and intent at non-towered fields and not knowing when a transponder is required or may be turned off.
Gliders often operate without electrical systems, and candidates either over-apply powered-aircraft radio procedures or skip radio calls entirely. The transponder rules in 14 CFR 91.215 have glider-specific relief that candidates misstate.
What to do instead
Memorize the standard pattern calls (position, altitude, intent) and the CTAF and UNICOM frequencies for your home field. Learn the 91.215(b) transponder requirement and the glider exception in 91.215(b)(3) as exact text, and practice announcing a simulated pattern entry with an instructor listening.
Assuming the glider's published best glide speed is the correct speed in all conditions, rather than adjusting for headwind, sink, and weight.
The POH gives one number and candidates treat it as universal. In reality, best glide speed increases with headwind and sink and decreases with tailwind, and the speed-to-fly ring on the variometer exists precisely because the correct speed varies. Candidates also forget that heavier loading raises the best glide speed.
What to do instead
Learn the speed-to-fly concept and practice computing the adjusted speed for a 15-knot headwind and a 2-knot sink band using the McCready ring or a simple table. State the rule: add speed for headwind and sink, subtract for tailwind. Fly three approaches at the adjusted speed with an instructor and compare sink rate to the still-air number.