This issue is related to Traffic Global by JustFlight. 

You MUST deactivate their AirportFacilities in the simulator Scenery Library.

Custom AFCADS are stored in C:\Users\xxxx\Documents\TrafficGlobal\AirportFacilities.

PAPI lights in BIAR (RWY 01) are calibrated for two types of approaches.
RIGHT -> LOC approach with GS with 3.5 degrees gradient
LEFT -> ILS approach with 5.3 degrees gradient

Please check the charts and select the proper approach for your plane type before going to BIAR.

There may be several reasons for elevation issues. They usually happen because of conflicting files, or wrong scenery layering.

• First of all, check your P3D Scenery Library layering. Make sure the scenery always stays on the TOP and ORBX, MESH, AI addons are below. This is a universal rule that may help to avoid future conflicts.

• Navigate to your Prepar3D v4\Scenery\World\scenery folder and check if there are any files containing BIKF/BIAR in the name present inside?
  If there are make sure to change their extensions to .off or move them away to a temporary location.
• Some AI addons have custom afcads provided, usually with data that won’t match custom scenery. If you own Global Traffic by JustFlight please do the following action:
  You MUST deactivate their AirportFacilities in the simulator Scenery Library.
  Custom AFCADS are stored in C:\Users\xxxx\Documents\TrafficGlobal\AirportFacilities 
• Open ORBX Central and run a VECTOR Configuration tool
  Run Auto-Configuration and check IF AEC IS DISABLED FOR:
  BIKF
  BIGR
  Press Apply and run your P3D.
• Use Simple Airport Scanner to scan your airport afcads.https://www.fsdeveloper.com/forum/threads/simple-airport-scanner-1-70-beta.440300/

  Open the program:

  
  1. Select your FS Version (top right)
  2. Point it to P3D V4 Scenery.cfg

  
  3. Press scan.
  4. Check the results if there are any custom AFCADS present.

• Setup Insertion Point in ORBX Central
  

  

  Navigate to Settings -> Insertion Point

  In ORBX Airports and Regions select it to be INSERTED BELOW last custom scenery you own.

The installer should automatically rename the ORBX files, but in some cases (antivirus, admin privileges, or locating problems) it won’t. In this case, you need to take manual action.

If you have ORBX FTX Iceland or Open LC scenery installed you MUST deactivate/move away the following files:

Prepar3D v4 or OTHER \ ORBX \ FTX_OLC \ OLC_EU8 \ Scenery

01_APTBIKF.BGL

01_APTBIAR.bgl

02_APTBIKF_CVX.bgl

02_APTBIAR_CVX.bgl

FTX_FTXG_BIKF_objects.bgl

FTX_FTXG_BIAR_objects.bgl

Prepar3D v4 or OTHER \ ORBX \F TX_OLC \ OLC_EU9 \ Scenery

02_DEM4109.bgl

We recommend changing the files extensions to .off from .bgl.

This is a BUG of P3D which considers Summer + Day conditions as night. You may observe this problem in the P3D main menu when selecting your Time and Season.

It seems to be related to only a few days in June.

This won’t cause any issues besides lights appearing during the day.

It was reported to the Lockheed Martin team and we hope this will get fixed soon. The error is related to P3D timezones.

We included the following airports in the package:

BIKF – fully detailed rendition.

BIAR – a medium detailed rendition that comes as a bonus airport in the package.

BIGR – photo scenery and afcad adjusted to cooperate nicely with ORBX Iceland Demo/Open LC Europe

BIIS – photo scenery and afcad adjusted to cooperate nicely with ORBX Iceland Demo/Open LC Europe

Our Keflavik scenery is compatible with:

– ORBX Global

– ORBX Open LC

– ORBX VECTOR

You may however have to follow a few steps and disable some BGL files to avoid conflicts.

More specific information about it in another FAQ question.