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Glossary

PHAK Glossary: O

14 entries, reproduced verbatim from the Glossary of the Pilot’s Handbook of Aeronautical Knowledge, FAA-H-8083-25C (July 2023).

Obstacle departure procedures (ODP)

A preplanned instrument flight rule (IFR) departure procedure printed for pilot use in textual or graphic form to provide obstruction clearance via the least onerous route from the terminal area to the appropriate en route structure. ODPs are recommended for obstruction clearance and may be flown without ATC clearance unless an alternate departure procedure (SID or radar vector) has been specifically assigned by ATC.

PHAK Glossary, page G-22

Occluded front

A frontal occlusion occurs when a fastmoving cold front catches up with a slow moving warm front. The difference in temperature within each frontal system is a major factor in determining whether a cold or warm front occlusion occurs.

PHAK Glossary, page G-22

Omission error

The failure to anticipate significant instrument indications following attitude changes; for example, concentrating on pitch control while forgetting about heading or roll information, resulting in erratic control of heading and bank.

PHAK Glossary, page G-22

Optical illusion

A misleading visual image. For the purpose of this handbook, the term refers to the brain’s misinterpretation of features on the ground associated with landing, which causes a pilot to misread the spatial relationships between the aircraft and the runway.

PHAK Glossary, page G-22

Orientation

Awareness of the position of the aircraft and of oneself in relation to a specific reference point.

PHAK Glossary, page G-22

Outer marker

A marker beacon at or near the glideslope intercept altitude of an ILS approach. It is normally located four to seven miles from the runway threshold on the extended centerline of the runway.

PHAK Glossary, page G-22

Outside air temperature (OAT)

The measured or indicated air temperature (IAT) corrected for compression and friction heating. Also referred to as true air temperature.

PHAK Glossary, page G-22

Overcontrolling

Using more movement in the control column than is necessary to achieve the desired pitch-andbank condition.

PHAK Glossary, page G-22

Overboost

A condition in which a reciprocating engine has exceeded the maximum manifold pressure allowed by the manufacturer. Can cause damage to engine components.

PHAK Glossary, page G-22

Overpower

To use more power than required for the purpose of achieving a faster rate of airspeed change.

PHAK Glossary, page G-22

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The Private Pilot Quick-Review Study Guide covers this in the chapters these terms come up in. It is in CFI review and not on sale yet; the guide page has the list for launch notes.

Source. Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Glossary, FAA-H-8083-25C (July 2023), pages G-1 to G-36, reproduced verbatim from the FAA’s PDF (https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak; SHA-256 begins 247929cace0ab56b). The PDF’s line breaks were re-joined into one paragraph per entry; no word was changed. A United States Government work. Check the current handbook before you rely on an entry here.