Do i need a compass?

[gassman]

I have dynon hdx. Do I still need a stand alone compass?

 

[j4cbo]

Short answer: no.

Long answer: no (there's a magnetic sensor in the ADAHRS).

 

[rv6ator]

FAR's say "magnetic direction indicator".

 

[bobnoffs]

i think that wording applied before gps was ever invented. if you know [and you should] the magnetic deviation where you are flying...well, there you go.

 

[RV7A Flyer]

i think that wording applied before gps was ever invented. if you know [and you should] the magnetic deviation where you are flying...well, there you go.

True, but it won't satisfy the requirements for a DAR or FSDO to issue an AWC.

The problem comes when some ill-informed inspector believes that you HAVE to have a "wet compass" despite your EFIS and its own magnetic direction indicator...

 

[gassman]

True, but it won't satisfy the requirements for a DAR or FSDO to issue an AWC.

The problem comes when some ill-informed inspector believes that you HAVE to have a "wet compass" despite your EFIS and its own magnetic direction indicator...

 

[gassman]

I should have asked if I need one legally for my inspection

 

[Bruce]

This $5.00 will save you.
Just saying

Boomer

 

[D-Dubya]

I should have asked if I need one legally for my inspection

No

 

[Mel]

True, but it won't satisfy the requirements for a DAR or FSDO to issue an AWC.

The problem comes when some ill-informed inspector believes that you HAVE to have a "wet compass" despite your EFIS and its own magnetic direction indicator...

Not so! It DOES satisfy the requirements for a DAR or a properly informed FSDO. First off, for daytime VFR, NO instruments are required as part 205 does not apply to experimental aircraft. And your Op Lims will clearly state that for night and/or IFR, you must meet the requirements of part 205 wich uses the term "magnetic direction indicator". It says nothing about the indicator being independent.

 

[lr172]

Not so! It DOES satisfy the requirements for a DAR or a properly informed FSDO. First off, for daytime VFR, NO instruments are required as part 205 does not apply to experimental aircraft. And your Op Lims will clearly state that for night and/or IFR, you must meet the requirements of part 205 wich uses the term "magnetic direction indicator". It says nothing about the indicator being independent.

my fsdo guy would simply not accept it; he demanded a compass. Showed him the wording and he said "yes, mag dir indicator means compass; no compass, no awc." I just installed a cheap one, as it wasn't worth the consequences of arguing with him.

 

[Ironflight]

my fsdo guy would simply not accept it; he demanded a compass. Showed him the wording and he said "yes, mag dir indicator means compass; no compass, no awc." I just installed a cheap one, as it wasn't worth the consequences of arguing with him.

And….he was wrong, becaue as Mel noted above, NOTHIGN is required for DVFR ops. The first sentence of 91.205 starts with “For aircraft with a Standard Airworthiness Certificate…..” You have a “Special” Airworthiness, so it doesn’t apply unless called out by your ops Lims (as it does for night or IFR).

 

[rocketman1988]

I should have asked if I need one legally for my inspection

my fsdo guy would simply not accept it; he demanded a compass. Showed him the wording and he said "yes, mag dir indicator means compass; no compass, no awc." I just installed a cheap one, as it wasn't worth the consequences of arguing with him.

He was 100% incorrect.

 

[gassman]

Ok. So I may or may not need one

 

[gassman]

Ill see what he says and install if necessary

 

[Carlos151]

Ask him to show you the reg that says "wet compass required".
I'm guessing he will not be able to.
And no, magnetic direction indicator does not equal wet compass.
FAR 91.205 clearly states "magnetic direction indicator". Your EFIS will have that and it will show your heading (magnetic). AHARS has a built in magnetometer but you can also have a remote magnetometer like Dynon provides. Even they call it a "remote compass".

 

[BobTurner]

In my experiences with the FSDO, I’ve found that they are jacks of all trades, not necessarily experts on EAB. But they are usually reasonable (although not always), and willing to be politely educated. Show them the comments from the DARs, above. Politely remind them that they are only certifying for phase 1, day, vfr only, where 91.205 does not apply. Later, you will self-certify for phase 2. If they persist, well, your choice to give in or fight.

 

[gassman]

In my experiences with the FSDO, I’ve found that they are jacks of all trades, not necessarily experts on EAB. But they are usually reasonable (although not always), and willing to be politely educated. Show them the comments from the DARs, above. Politely remind them that they are only certifying for phase 1, day, vfr only, where 91.205 does not apply. Later, you will self-certify for phase 2. If they persist, well, your choice to give in or fight.

If I get the inspector I think im getting, ive known him for 20+ years and hes a good guy. Hes inspected a bunch of rvs around here so.....hopefully hes still a good guy