Originally Posted by
manazir66
How much error (in miles) are we allowed on a DME arc?
V. AREA OF OPERATION: NAVIGATION SYSTEMS
A. TASK: INTERCEPTING AND TRACKING NAVIGATIONAL SYSTEMS AND DME ARCS
REFERENCES: 14 CFR parts 61, 91; FAA-H-8083-15; AIM.
NOTE: Any reference to DME arcs, ADF, or GPS shall be disregarded if the aircraft is not equipped with these specified navigational systems.
Objective. To determine that the applicant:
1.Exhibits adequate knowledge of the elements related to intercepting and tracking navigational systems and DME arcs.
2.Tunes and correctly identifies the navigation facility.
3.Sets and correctly orients the course to be intercepted into the course selector or correctly identifies the course on the RMI.
4.Intercepts the specified course at a predetermined angle, inbound or outbound from a navigational facility.
5.Maintains the airspeed within +/-10 knots, altitude within +/-100 feet, and selected headings within +/-5°.
6.Applies proper correction to maintain a course, allowing no more than three-quarter-scale deflection of the CDI or within +/-10° in case of an RMI.
7.Determines the aircraft position relative to the navigational facility or from a waypoint in the case of GPS.
8.Intercepts a DME arc and maintain that arc within +/-1 nautical mile.
9.Recognizes navigational receiver or facility failure, and when required, reports the failure to ATC.
Originally Posted by
manazir66
How can you calculate distance from one fix to another on a DME Arc.
It has something to do with the radials each fix is on...and how far away you are from the VOR...other than that I'm not sure.
Originally Posted by
manazir66
What the 21.1G meant above the VOR box?
I've looked all over my Jepps and the only thing i can think of is possibly that is the ground freq for a co located airport/vor. Ground at that particular place is 121.1...But this is most likely very far off, i dunno.
Originally Posted by
manazir66
There is a question on expressjet gouge "know what to do when cleared for the approach 100 miles out at fl250." what would be the correct way of doing it?
You use a rule of thumb to determine when you should descend instead of just guessing. Some common rules of thumb are:
NM/MIN = Indicated Mach Number (IMN) x 10
? = .85 x 10
8.5nm/min at .85 mach
TAS = IAS + (FL/2)
? = 320 + 350/2
490 KTAS at 320 KIAS at FL350
Rule of Three
For every 1000ft of altitude loss, plan ahead for 3 nm (for a 3 degree glideslope)
FL350 down to FL180
17 x 3 = 51 miles to descend from FL350 to FL180