diff --git a/tests/functional/gtcs/test_external_file_06_d.py b/tests/functional/gtcs/test_external_file_06_d.py
index 786df973..0f59b37d 100644
--- a/tests/functional/gtcs/test_external_file_06_d.py
+++ b/tests/functional/gtcs/test_external_file_06_d.py
@@ -8,66 +8,61 @@ DESCRIPTION:
   Original test see in:
   https://github.com/FirebirdSQL/fbtcs/blob/master/GTCS/tests/EXT_REL_0_6_D.script
 NOTES:
-[03.03.2021]
+[03.03.2021] pzotov
   Added substitution for zero value ('F02') as result of evaluating exp(-745.1332192):
   on Windows number of digits in decimal representation more than on Linux for 1.
+NOTES:
+  [31.07.2022] pzotov
+  1. FB config must allow creation of external tables, check parameter 'ExternalFileAccess'.
+     Otherwise: SQLSTATE = 28000 / Use of external file at location ... is not allowed ...
+  2. REMOVED evaluation of exp(-745.***) because results depends on CPU (intel vs AMD).
+  Checked on 3.0.8.33535, 4.0.1.2692, 5.0.0.591
 """
 
+
+from pathlib import Path
 import pytest
 from firebird.qa import *
 
 db = db_factory()
 
-act = python_act('db', substitutions=[('[ \t]+', ' '), ('0.0000000000000000', '0.000000000000000')])
+act = python_act('db', substitutions=[('[ \t]+', ' '), ('(INPUT|OUTPUT)\\s+message .*', ''), (':\\s+(name:|table:)\\s+.*', '') ])
+
+tmp_ext_file = temp_file('tmp_gtcs_external_file_06_double_precision.dat')
+
+expected_stderr = """
+"""
 
 expected_stdout = """
-    F01 4.940656458412465e-324
-    F02 0.0000000000000000
-    F03 1.797693134862273e+308
+    01: sqltype: 480 DOUBLE Nullable scale: 0 subtype: 0 len: 8
+    02: sqltype: 480 DOUBLE Nullable scale: 0 subtype: 0 len: 8
+    F01 3.141592653589793
+    F02 2.718281828459045
     Records affected: 1
 """
 
-@pytest.mark.skip('FIXME: Not IMPLEMENTED')
 @pytest.mark.version('>=3.0')
-def test_1(act: Action):
-    pytest.fail("Not IMPLEMENTED")
+def test_1(act: Action, tmp_ext_file: Path):
+    
+    sql_cmd = f'''
+        create domain dm_dp double precision;
+        create table ext_table external file '{str(tmp_ext_file)}' (f01 dm_dp, f02 dm_dp);
+        commit;
+        insert into ext_table (f01, f02) values( pi(), exp(1) );
+        commit;
+        set list on;
+        set count on;
+        set sqlda_display on;
+        select * from ext_table;
+        commit;
+        drop table ext_table;
+        exit;
+    '''
 
-# test_script_1
-#---
-#
-#  import os
-#  import sys
-#  import subprocess
-#  import time
-#
-#  tmp_file = os.path.join(context['temp_directory'],'tmp_ext_06_d.tmp')
-#  if os.path.isfile( tmp_file):
-#       os.remove( tmp_file )
-#
-#  this_fdb = db_conn.database_name
-#
-#  sql_cmd='''
-#      connect 'localhost:%(this_fdb)s' user '%(user_name)s' password '%(user_password)s';
-#      create domain dm_dp double precision;
-#      create table ext_table external file '%(tmp_file)s' (f01 dm_dp, f02 dm_dp, f03 dm_dp);
-#      commit;
-#      insert into ext_table (f01, f02, f03) values( exp(-745.1332191), exp(-745.1332192), exp(709.78271289338404) );
-#      commit;
-#      -- connect 'localhost:%(this_fdb)s' user '%(user_name)s' password '%(user_password)s';
-#      set list on;
-#      set count on;
-#      select * from ext_table;
-#  ''' % dict(globals(), **locals())
-#
-#  runProgram('isql', [ '-q' ], sql_cmd)
-#
-#  f_sql_chk = open( os.path.join(context['temp_directory'],'tmp_ext_06_d.sql'), 'w')
-#  f_sql_chk.write(sql_cmd)
-#  f_sql_chk.close()
-#
-#  time.sleep(1)
-#
-#  os.remove(f_sql_chk.name)
-#  os.remove( tmp_file )
-#
-#---
+    act.expected_stdout = expected_stdout
+    act.expected_stderr = expected_stderr
+
+    act.isql(switches=['-q'], input = sql_cmd )
+
+    assert (act.clean_stderr == act.clean_expected_stderr and
+            act.clean_stdout == act.clean_expected_stdout)