Generic Enroute Course 301 - Minimum Altitudes and Vertical Separation

Flashcards covering terrain clearance, minimum IFR altitudes, altimeter settings, and vertical separation techniques including the ladder technique.

Minimum altitudes for IFR operations are established and are usually __________ above any known obstacles.

1000 feet

In designated mountainous regions areas 1 and 5, flight shall be at least __________ above the highest obstacle.

2000 feet

In designated mountainous regions areas 2, 3 and 4, flight shall be at least __________ above the highest obstacle.

1500 feet

Minimum altitudes in mountainous regions are calculated within __________ of the aircraft in flight.

$$5\,NM$$

The __________ is the lowest altitude established for use in a specific airspace and provides obstacle clearance.

Minimum IFR Altitude

The __________ is the lowest altitude on an airway which guarantees the aircraft will have terrain clearance.

Minimum obstacle clearance altitude (MOCA)

The __________ assures acceptable navigational signal coverage and meets IFR obstacle clearance requirements.

Minimum enroute altitude (MEA)

The __________ is not restricted to an airway and provides vertical clearance of 1000 ft or 2000 ft above all obstacles in a specified area.

Area Minimum Altitude (AMA)

The __________ provides 1000 ft clearance above objects within a 25 NM radius centered on a radio aid.

Minimum Sector Altitude (MSA)

The radius for a Minimum Sector Altitude (MSA) is centered on a radio aid to navigation or a specified point and covers __________.

$$25\,NM$$

An __________ is specific to ATS surveillance control and meets obstacle clearance and radio coverage requirements.

Minimum Vectoring Altitude (MVA)

The __________ is flight checked and approved for use within 100 miles of the geographical centre of the aerodrome.

Safe altitude 100 nautical miles

The __________ describes the change from one phase of flight or flight conditions to another, such as enroute to approach.

Transition altitude

A __________ is used to connect a SID to enroute airways or enroute airways to a STAR.

transition

Controllers must inform the pilot if a requested altitude is __________ the minimum IFR altitude.

below

A controller may approve an altitude below the MEA, but at or above the MOCA, for a __________ flight.

MEDEVAC

If a pilot requests it, an altitude below the MEA may be approved if __________ provides adequate navigation accuracy along the segment.

GNSS navigation

When an aircraft is __________ an airway, you may clear it to an altitude below the MEA but at or above another minimum IFR altitude.

traversing

If the MEA is __________ beyond the next fix, clear the aircraft to climb in sufficient time to cross the fix at the new altitude.

higher

If the MEA is lower beyond the next fix, do not clear the aircraft to descend until after it __________ the fix.

passes

When stations are separated by more than __________, pilots set the altimeter to a station near the route of flight.

$$150\,\text{nautical miles}$$

In the standard pressure region, the altimeter is set to __________ inches of mercury.

$$29.92$$

In the standard pressure region, the altimeter is set to __________ millibars.

$$1,013.2$$

When flying from the altimeter-setting region into the standard pressure region, pilots set the altimeter immediately __________ entry.

after

Every one hundredth of an inch of mercury is equivalent to __________.

$$10\,\text{feet}$$

The difference in vertical separation between $29.92$ and $28.92$ is __________.

$$1000\,\text{feet}$$

If the altimeter setting is __________ or lower, the controller must state the setting twice.

$$28.99$$

If the altimeter setting is __________ or higher, the controller must state the setting twice.

$$31.00$$

If the altimeter setting changes by __________ or more, a revised altimeter setting must be issued.

0.02 inches

If a pilot asks for the type of altimeter setting provided, identify it as __________, meaning height above sea level.

QNH

An aircraft is considered to have vacated an altitude when the Mode C shows __________ of movement.

$$300\,\text{feet}$$

To apply the ladder technique safely, aircraft involved must have __________ climb and descent rates.

similar

If __________ is known to exist, a report at a vertically separated altitude is required before assigning the vacated altitude.

severe turbulence

Disturbed airflow resulting from air moving vertically in __________ is a cause of turbulence.

convective currents

Disturbed airflow resulting from air moving past or over __________ such as irregular terrain is a cause of turbulence.

obstructions

A __________ is a cruising technique resulting in a net increase in altitude as the aircraft mass decreases.

CRUISE CLIMB

A cruise climb allows the pilot the option of __________ at any intermediate altitude.

levelling off

For an aircraft in a cruise climb, a report from an altitude vertically separated by __________ is usually required.

1000 feet

In the absence of Mode C, the controller should request __________ altitude leaving reports.

intermediate

When laddering aircraft without Mode C, clear the __________ aircraft to the new altitude first.

leading

The ladder technique is often used in a departure situation with two aircraft of same performance routed out the same __________.

airway/gate

One advantage of the ladder technique is that __________ is assured.

separation

A disadvantage of the ladder technique is increased __________.

workload

If the altimeter setting is extracted from a METAR or SPECI, the controller must include the __________ of the report.

time

If the altimeter setting is higher than $31.00$, the controller must confirm that the pilot has set the aircraft altimeter to __________.

$$31.00$$

The __________ altitude applies in close proximity to a NAVAID and is depicted on a CAP Chart.

Minimum Sector Altitude (MSA)

Minimum IFR altitudes may or may not be within __________ airspace.

controlled

The MSA is based on a circle with a radius of $25\,NM$ centered on a radio aid to navigation or a __________.

specified point

An altitude found on CAP charts flight checked for use within $100\,NM$ of an aerodrome is the __________.

Safe altitude 100 nautical miles

The difference between $29.92$ and $29.82$ is __________.

$$100\,\text{feet}$$