# How do you calculate obstacle clearance altitude?

## How do you calculate obstacle clearance altitude?

The nonstandard ROC expressed in ft/NM can be calculated using the formula: (0.24 h) = (0.76 d) where “h” is the height of the obstacle above the altitude from which the climb is initiated, and “d” is the distance in NM from the initiation of climb to the obstacle.

### What is the purpose of the off Route obstruction clearance altitude Oroca?

OROCA is an off route altitude which provides obstruction clearance with a 1,000 foot buffer in non-mountainous terrain areas and a 2,000 foot buffer in designated mountainous areas within the U.S. This altitude may not provide signal coverage from ground based navigational aids, air traffic control radar, or …

At what minimum altitude must you be at to turn for a departure procedure for obstacle clearance?

Unless specified otherwise, required obstacle clearance for all departures, including diverse, is based on the pilot crossing the departure end of the runway at least 35 feet above the departure end of runway elevation, climbing to 400 feet above the departure end of runway elevation before making the initial turn, and …

What is the maximum altitude at which you can file for a victor route?

18,000 feet
altitude airways in the United States can be navigated using NAVAIDs, have names that start with the letter V, and are called Victor Airways. [Figure 2-3] They cover altitudes from approximately 1,200 feet above ground level (AGL) up to, but not including 18,000 feet above mean sea level (MSL).

## What is an obstacle clearance height defined as?

Obstacle clearance altitude (OCA) or Obstacle clearance height (OCH): The lowest altitude or the lowest height above the elevation of the relevant runway threshold or the aerodrome elevation as applicable used in establishing compliance with appropriate obstacle clearance criteria.

### What is the purpose of an off Route obstruction clearance altitude along a designated route quizlet?

OROCA – Off Route Obstruction Clearance Altitude; this provides obstruction clearance with a 1,000 foot buffer in non-mountainous terrain areas and a 2,000 foot buffer in mountainous areas.

Is Oroca MSL or AGL?

Flight Planning When planning your flight remember that the MEF and OROCA are listed in msl and ceilings are in agl.

What altitude can you turn after takeoff?

Generally, the consensus is that you shouldn’t turn unless you’re above 1000 feet AGL. If you need a one size fits all approach that may be a good one, but we all have different size feet. You must decide what’s right for you. As an instructor, I’m a firm believer in personal minimums.

## What is the minimum holding altitude?

The Minimum Holding Altitude (MHA) is the lowest altitude prescribed for a holding pattern that assures navigational signal coverage, communications, and meets obstacle clearance requirements.

### What is the 34 1 surface?

The 34:1 surface equates to the OCS slope associated with a typical 3 degree ILS glidepath. If this surface is penetrated, nothing about the approach needs to change except the required visibility, which is limited to no less than 3/4 SM.

What is the obstacle clearance altitude of military aircraft?

MINIMUM SECTOR ALTITUDE [ICAO]- The lowest altitude which may be used under emergency conditions which will provide a minimum clearance of 300 m (1,000 feet) above all obstacles located in an area contained within a sector of a circle of 46 km (25 NM) radius centered on a radio aid to navigation.

Can you fly below the MEA?

IFR GPS aircraft can be cleared below the MEA down to the MOCA if there is one. Absent a MOCA, ATC can assign altitudes at or above the MVA or MIA along the route of flight and must issue lost communication instructions.

## Can you fly at MOCA?

If we are flying at or above the MOCA, 10,300 feet, we are guaranteed obstruction clearance along the whole route. Specifically, we have 1000 feet of clearance above the highest obstacle within 4 miles of the airway centerline, or 2000 feet of clearance in designated mountainous terrain.

### When should you fly an ODP?

The FAA creates an ODP if obstacles require that a climb of more than 200 feet per nm be maintained for acceptable terrain separation. In conjunction with a prescribed lateral path, the ODP often will require that the aircraft be able to maintain a specified climb gradient steeper than the standard 200 feet nm.

When operating under IFR with an VFR on top clearance what altitude should be maintained?

8,600 feet. What minimums must be considered in selecting an altitude when operating with a VFR-on-Top clearance? Minimum IFR altitude, minimum distance from clouds, and visibility appropriate to altitude selected.

What is obstacle clearance altitude (OCA)?

Obstacle clearance altitude is referenced to mean sea level and OCH to the threshold elevation or in the case of non-precision approaches to the airport elevation or the threshold elevation if that is less than 2 m (7 ft) below the airport elevation. An obstacle clearance height for a circling approach is referenced to the airport elevation.

## What is oroca in aviation?

Definition of OROCA Instrument Procedures Handbook An off-route obstruction clearance altitude (OROCA) is an off-route altitude that provides obstruction clearance with a 1,000-foot buffer in non- mountainous terrain areas and a 2,000-foot buffer in designated mountainous areas within the United States.

### What is the minimum vertical separation between the obstacle elevations?

The MOCA will specify minimum vertical separation: 1 1000ft (300m) separation when the obstacle elevations is below 3000ft (900m) 2 1500ft (450m) separation when the obstacle elevations is between 3000ft (900m) to 5000ft (1500m). 3 2000ft (600m) separation when the obstacle elevations is greater than 5000ft (1500m or more).

What is the minimum distance between two obstacles for MOCA?

1500ft (450m) separation when the obstacle elevations is between 3000ft (900m) to 5000ft (1500m). 2000ft (600m) separation when the obstacle elevations is greater than 5000ft (1500m or more). The MOCA is always related with one MEA.