Pilot Ground Knowledge - Instrument > Approaches > Flashcards

Approaches Flashcards

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1
Q

What is the purpose of an instrument approach procedure (IAP)?

A

To provide a safe and standardized method for transitioning from the en route environment to a landing, especially in low visibility conditions.

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2
Q

What is the Initial Approach Fix (IAF)?

A

The fix where the instrument approach begins; aircraft transition from STARs or feeder routes here.

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3
Q

What is the Intermediate Fix (IF)?

A

The fix between the initial approach and final approach segments, allowing setup for the final descent and alignment.

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4
Q

What is the Final Approach Fix (FAF)?

A

The fix where the final approach segment begins, usually where the aircraft is fully configured for landing.

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5
Q

What is a missed approach point (MAP)?

A

The point at which a pilot must initiate a missed approach if the runway environment is not visible or landing criteria are not met.

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6
Q

What is a step-down fix in an approach?

A

A fix along the approach where the aircraft must descend to a specified altitude, ensuring obstacle clearance.

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7
Q

What is a precision approach?

A

An instrument approach providing both lateral and vertical guidance to the runway (e.g., ILS, LPV).

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8
Q

What is a non-precision approach?

A

An approach providing only lateral guidance (e.g., VOR, NDB, LOC approaches).

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9
Q

What is a stabilized approach?

A

An approach flown with the aircraft on the correct glidepath, airspeed, and configuration, allowing a safe landing or timely go-around.

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10
Q

What are approach minimums?

A

The lowest authorized ceiling and visibility for landing on an instrument approach.

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11
Q

What is a circling approach?

A

An approach where the aircraft transitions visually to land on a runway not aligned with the final approach course.

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12
Q

What is a visual descent point (VDP)?

A

The point on a non-precision approach where a normal descent from the MDA to the runway may begin if the runway environment is in sight.

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13
Q

What is a minimum descent altitude (MDA)?

A

The lowest altitude a pilot may descend to on a non-precision approach without having the runway environment in sight.

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14
Q

What is a decision altitude (DA) or decision height (DH)?

A

The altitude on a precision approach at which the pilot must decide to continue landing or execute a missed approach.

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15
Q

What is a missed approach procedure (MAP)?

A

A published route to follow if the approach cannot be completed safely, ensuring obstacle clearance and ATC integration.

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16
Q

What is the significance of approach segments?

A

Dividing an approach into initial, intermediate, final, and missed approach segments ensures predictable aircraft paths and obstacle clearance.

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17
Q

What is a feeder route in an approach?

A

A route connecting en route structure or STARs to the IAF, ensuring safe transition to the approach.

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18
Q

How are instrument approach charts used for planning?

A

They provide fix locations, altitudes, course guidance, minimums, airport layout, lighting, and missed approach instructions.

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19
Q

What is the purpose of approach lighting systems (ALS)?

A

To provide visual guidance during final approach, assisting in the transition from instruments to visual landing.

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20
Q

How are approach transitions assigned?

A

Based on aircraft direction, runway in use, and published feeder routes to ensure obstacle clearance and ATC separation.

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21
Q

What is a precision approach radar (PAR)?

A

An ATC radar procedure providing precise lateral and vertical guidance to the runway.

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22
Q

What is an approach gate?

A

A defined point along the final approach where pilots verify alignment, configuration, and speed before continuing descent.

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23
Q

How do pilots determine visibility minimums?

A

By referencing approach charts, considering RVR, prevailing visibility, and type of approach (precision or non-precision).

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24
Q

What is a stabilized final approach?

A

The aircraft is on the proper course, glidepath, and speed with landing configuration completed by a specified altitude.

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25
What is a step-down approach?
A non-precision approach with multiple step-down fixes allowing gradual descent while maintaining obstacle clearance.
26
What is a constant-angle descent?
A descent along a straight glidepath at a fixed angle to the runway, often used in precision approaches.
27
What is a straight-in approach?
An approach aligned with the landing runway, allowing aircraft to descend directly without circling.
28
What is a circling minimum?
The lowest MDA or DA from which a pilot may circle to land on a runway not aligned with the final approach course.
29
What is the significance of approach lighting and touchdown zone elevation?
They assist in determining descent points, VDP, and visual reference for landing.
30
What is a localizer approach?
A non-precision approach providing lateral guidance using the runway localizer.
31
What is a glideslope in an ILS approach?
The vertical guidance signal that provides a precise glidepath to the runway threshold.
32
How is a missed approach executed?
By following published instructions or ATC clearance, climbing to assigned altitudes, and avoiding obstacles.
33
What is a minimum safe altitude (MSA) on approach charts?
Provides 1,000 ft obstacle clearance within 25 NM of a navigation aid for emergency planning.
34
What is a final approach course?
The published course from the FAF or final segment to the runway threshold.
35
What is the FAF and its significance in instrument approaches?
The fix where the final approach segment begins; altitude and configuration are verified before descent.
36
How is vertical guidance achieved in non-precision approaches?
Using step-down fixes or VNAV in RNAV procedures; visual aids may be used below MDA.
37
What is a precision approach with vertical navigation (LPV)?
An RNAV GPS approach with both lateral and vertical guidance similar to an ILS.
38
How do pilots manage approach transitions in congested airspace?
Using published STARs, feeder routes, ATC vectors, and sequencing to maintain safe spacing and obstacle clearance.
39
What is a visual approach clearance?
ATC allows pilots to proceed visually to the airport, usually from a STAR or radar vector, provided they maintain visual contact with the airport or preceding traffic.
40
What is a contact approach?
An approach initiated by the pilot, requiring clear of clouds and at least 1 SM visibility, proceeding to the airport using visual references.
41
How are approach minimums affected by runway type and equipment?
Precision approaches have lower minimums than non-precision; lighting, approach aids, and aircraft equipment affect minimums.
42
What is the difference between DA (decision altitude) and MDA (minimum descent altitude)?
DA is for precision approaches with vertical guidance; MDA is for non-precision approaches without vertical guidance.
43
What is the purpose of circling approach protection areas?
To ensure obstacle clearance while maneuvering visually around the airport for landing on a different runway.
44
How are missed approach holding points designated?
Published on approach charts, providing safe obstacle clearance and integration into the ATC traffic flow.
45
What is the significance of approach chart symbology?
Provides pilots with clear information about altitudes, courses, navigation aids, lighting, and minimums for safe approaches.
46
What is a stabilized approach in instrument conditions?
Maintaining proper glidepath, airspeed, and configuration, with the runway environment visible or at decision altitude, allowing landing or missed approach.
47
How are RNAV approaches different from conventional approaches?
RNAV approaches use GPS or RNAV waypoints for precise lateral/vertical guidance; conventional rely on VOR, NDB, or localizer signals.
48
What is the purpose of approach charts with multiple minimums?
To provide pilots with options based on aircraft equipment, approach category, or runway lighting for safe landing.
49
What is a decision point in a non-precision approach?
The point where the pilot must decide whether the runway environment is in sight to continue or execute a missed approach.
50
What are RNAV approach waypoints called in the final approach segment?
Final approach fixes (FAFs) or final approach waypoints (FAWPs).
51
How does a pilot determine the minimum descent altitude for circling?
By referencing the charted circling minimums for their aircraft category at the appropriate runway.
52
What is the purpose of the “step-down fix table” on approach charts?
To provide altitudes at fixes where descent may occur, ensuring obstacle clearance.
53
What is a “Runway Threshold Crossing Height” (TCH)?
The height above the runway threshold at which the aircraft should cross when on the glidepath.
54
How does a pilot calculate a Visual Descent Point (VDP) for a non-precision approach?
Using the charted MDA, runway threshold elevation, and standard 3° descent angle to the runway.
55
What is the significance of FAF to MAP distance?
It determines the length of the final approach segment, affecting descent planning and rate of descent.
56
How do RNAV approaches differ for LP, LNAV, and LNAV/VNAV?
LP: lateral precision; LNAV: lateral guidance only; LNAV/VNAV: lateral plus vertical guidance.
57
What is a “radius-to-fix” (RF) leg in RNAV approaches?
A curved segment between waypoints requiring precise turn radius to maintain the published path.
58
How is the missed approach climb gradient determined?
Based on obstacle clearance requirements and published climb gradients, typically 200–300 ft/NM minimum.
59
What is the purpose of approach lighting system decision height reference?
To provide a visual reference for pilots to continue landing or execute a missed approach at DA.
60
How does a pilot manage approach speed to comply with obstacle clearance?
By adhering to maximum approach speeds and descent profiles published on the approach chart.
61
What are the differences between “straight-in” and “offset final” approaches?
Straight-in is aligned with runway centerline; offset requires maneuvering to align with the runway visually or with vectors.
62
What is the significance of the “final approach course width”?
Defines lateral protection area for obstacle clearance and ensures safe alignment with the runway.
63
How do RNP approaches enhance safety?
By requiring aircraft to maintain a specific navigation performance (RNP value), allowing precise paths through terrain or congested airspace.
64
What is an approach lighting system with sequenced flashing lights (e.g., ALSF-1)?
Provides visual guidance at night or low visibility, improving runway threshold identification and alignment.
65
How does ATC integrate radar vectors with RNAV final approach fixes?
ATC may vector aircraft to intercept the final approach course while ensuring separation from other traffic and terrain.
66
What is the purpose of a “missed approach holding fix”?
Provides a safe location for aircraft to hold if the approach cannot be completed, maintaining obstacle clearance.
67
How is circling approach maneuvering determined?
By aircraft category, airport layout, visibility, and obstacle clearance, using charted circling minimums.
68
What is a stabilized approach profile for LNAV/VNAV approaches?
Maintaining proper vertical descent path, airspeed, and configuration from FAF to runway threshold.
69
How do approach chart notes affect pilot decisions?
They provide essential restrictions, cautions, or operational procedures for safe conduct of the approach.
70
What is the significance of DA/H versus MDA in approach planning?
DA/H is used for precision approaches with glidepath guidance; MDA is for non-precision approaches requiring visual acquisition before descent.
71
How do advanced RNAV approaches incorporate obstacle avoidance?
Using 3D flight paths with vertical and lateral constraints to avoid terrain and obstacles precisely.
72
How do approach category speeds affect approach minimums?
Higher category speeds (e.g., Cat C or D) result in higher circling minimums due to larger turn radius and obstacle clearance.
73
What is a “visual segment transition” in an instrument approach?
The portion where pilots convert from instrument guidance to visual cues for runway alignment.
74
How is stabilized descent rate calculated for non-precision approaches?
Using altitude difference from FAF/MDA to runway threshold over the distance of the final approach segment.
75
What is the significance of approach lighting and runway threshold elevation for VDP?
Helps pilots calculate the point to begin a normal descent from MDA to the runway.
76
How are multiple approach minimums depicted on a chart?
Listed in tables by approach type, aircraft category, equipment, and lighting conditions.
77
What is the function of a MAP bar on charts?
Indicates the missed approach point visually, especially for non-precision approaches.
78
How do LNAV/VNAV approaches improve accuracy over traditional NPA?
Provide vertical guidance, allowing a more consistent descent profile and reducing pilot workload.
79
What is the importance of obstacle clearance altitude along final approach segments?
Ensures aircraft remain clear of terrain or structures when visual references are not yet established.
80
How do temperature and pressure affect approach minima?
Extremely low or high temperatures can affect altimeter readings, impacting descent and decision altitude accuracy.
81
How are missed approach procedures coordinated with ATC sequencing?
ATC assigns holding patterns or vectors at published fixes to maintain safe separation and re-enter the approach.
82
What is a “fly-over FAF” and why is it used?
The aircraft must cross the FAF waypoint before starting descent; ensures obstacle clearance and proper alignment.
83
What is a “visual segment for circling” approach?
Allows the pilot to maneuver visually around the airport to align with the landing runway, following obstacle clearance limits.
84
How are approach minima adjusted for airport elevation?
Higher elevation airports require increased DA/H or MDA to maintain consistent obstacle clearance above terrain.
85
How do advanced RNAV approaches handle offset runways?
By using precise waypoints and curved or angular final segments to transition safely from instrument path to runway centerline.
86
How is descent planning integrated with approach speed restrictions?
Pilots adjust vertical descent rate to comply with speed restrictions while ensuring arrival at FAF or VDP at proper altitude.
87
What is the significance of circling approach protected airspace?
Ensures obstacle clearance while maneuvering around airport for a runway not aligned with final approach.
88
How are visual aids used below DA/MDA?
Pilots acquire runway environment cues (lights, markings) to continue landing safely or execute missed approach if not visible.
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