diff --git a/modules/aerodyn/src/AeroDyn.f90 b/modules/aerodyn/src/AeroDyn.f90
index 88e7e33f1..2e141064c 100644
--- a/modules/aerodyn/src/AeroDyn.f90
+++ b/modules/aerodyn/src/AeroDyn.f90
@@ -3982,7 +3982,7 @@ SUBROUTINE ValidateInputData( InitInp, InputFileData, NumBl, calcCrvAngle, ErrSt
    
    if (InputFileData%DTAero <= 0.0)  call SetErrStat ( ErrID_Fatal, 'DTAero must be greater than zero.', ErrStat, ErrMsg, RoutineName )
    if (InputFileData%Wake_Mod /= WakeMod_None .and. InputFileData%Wake_Mod /= WakeMod_BEMT .and. InputFileData%Wake_Mod /= WakeMod_FVW) then
-      call SetErrStat ( ErrID_Fatal, 'WakeMod must be '//trim(num2lstr(WakeMod_None))//' (none), '//trim(num2lstr(WakeMod_BEMT))//' (BEMT), '// &
+      call SetErrStat ( ErrID_Fatal, 'Wake_Mod must be '//trim(num2lstr(WakeMod_None))//' (none), '//trim(num2lstr(WakeMod_BEMT))//' (BEMT), '// &
         ' or '//trim(num2lstr(WakeMod_FVW))//' (FVW).',ErrStat, ErrMsg, RoutineName ) 
    end if
    
@@ -4275,16 +4275,18 @@ SUBROUTINE ValidateInputData( InitInp, InputFileData, NumBl, calcCrvAngle, ErrSt
    if (InitInp%Linearize) then
 
       if (InputFileData%Wake_Mod /= WakeMod_None .and. InputFileData%Wake_Mod /= WakeMod_BEMT) then 
-         call SetErrStat( ErrID_Fatal, 'WakeMod must be 0 or 1 for linearization.', ErrStat, ErrMsg, RoutineName )
+         call SetErrStat( ErrID_Fatal, 'Wake_Mod must be 0 or 1 for linearization.', ErrStat, ErrMsg, RoutineName )
       endif
 
       if (InputFileData%UA_Init%UAMod /= UA_None .and. InputFileData%UA_Init%UAMod /= UA_HGM .and. InputFileData%UA_Init%UAMod /= UA_HGMV .and. InputFileData%UA_Init%UAMod /= UA_OYE) then
          call SetErrStat( ErrID_Fatal, 'UA_Mod must be 0, 4, 5, or 6 for linearization.', ErrStat, ErrMsg, RoutineName )
       end if
 
-      if (InputFileData%DBEMT_Mod /= DBEMT_None .and. InputFileData%DBEMT_Mod /= DBEMT_cont_tauConst) then
-         call SetErrStat( ErrID_Fatal, 'DBEMT Mod must be 0 or 3 (continuous formulation with constant tau1) for linearization. Set DBEMT_Mod=0,3.', ErrStat, ErrMsg, RoutineName )
-      end if
+      select case(InputFileData%DBEMT_Mod)
+      case (DBEMT_None, DBEMT_frozen, DBEMT_cont_tauConst)
+      case default
+         call SetErrStat( ErrID_Fatal, 'DBEMT_Mod must be -1 (frozen), 0 (none), or 3 (continuous formulation with constant tau1) for linearization. Set DBEMT_Mod=-1,0,3.', ErrStat, ErrMsg, RoutineName )
+      end select
 
       if (InputFileData%NacelleDrag) then
          call SetErrStat( ErrID_Fatal, 'Nacelle drag cannot currently be used for linearization. Set NacelleDrag = false.', ErrStat, ErrMsg, RoutineName )
diff --git a/modules/aerodyn/src/BEMT.f90 b/modules/aerodyn/src/BEMT.f90
index b312f64b6..f1eb5b1b9 100644
--- a/modules/aerodyn/src/BEMT.f90
+++ b/modules/aerodyn/src/BEMT.f90
@@ -636,7 +636,7 @@ subroutine BEMT_Init( InitInp, u, p, x, xd, z, OtherState, AFInfo, y, misc, Inte
    if (errStat >= AbortErrLev) return
 
    InitInp_DBEMT%DBEMT_Mod = p%DBEMT_Mod
-   if ( p%DBEMT_Mod > DBEMT_none ) then
+   if ( p%DBEMT_Mod > DBEMT_none .or. p%DBEMT_Mod == DBEMT_Frozen  ) then
       InitInp_DBEMT%DBEMT_Mod  = p%DBEMT_Mod
       InitInp_DBEMT%numBlades  = p%numBlades 
       InitInp_DBEMT%numNodes   = p%numBladeNodes
diff --git a/modules/aerodyn/src/DBEMT.f90 b/modules/aerodyn/src/DBEMT.f90
index 0dc4a55e5..4b8d001d0 100644
--- a/modules/aerodyn/src/DBEMT.f90
+++ b/modules/aerodyn/src/DBEMT.f90
@@ -64,9 +64,11 @@ subroutine DBEMT_ValidateInitInp(interval, InitInp, errStat, errMsg)
    errMsg  = ""
    
    if ( interval <= sqrt(epsilon(1.0_ReKi)) ) call SetErrStat( ErrID_Fatal, " The timestep size for DBEMT (interval) must be larger than sqrt(epsilon).", ErrStat, ErrMsg, RoutineName)
-   if ( (InitInp%DBEMT_Mod .ne. DBEMT_tauConst) .and. (InitInp%DBEMT_Mod .ne. DBEMT_tauVaries) .and. (InitInp%DBEMT_Mod .ne. DBEMT_cont_tauConst)) then
-      call SetErrStat( ErrID_Fatal, " DBEMT_Mod must be set to 1, 2, or 3.", ErrStat, ErrMsg, RoutineName)
-   end if
+   select case(InitInp%DBEMT_Mod)
+   case (DBEMT_frozen, DBEMT_tauConst, DBEMT_tauVaries, DBEMT_cont_tauConst)
+   case default
+      call SetErrStat( ErrID_Fatal, " DBEMT_Mod must be set to -1, 1, 2, or 3.", ErrStat, ErrMsg, RoutineName)
+   end select
    
    if (InitInp%numBlades < 1) call SetErrStat( ErrID_Fatal, " InitInp%numBlades must set to 1 or more.", ErrStat, ErrMsg, RoutineName)
    if (InitInp%numNodes < 2) call SetErrStat( ErrID_Fatal, " InitInp%numNodes must set to 2 or more.", ErrStat, ErrMsg, RoutineName)
@@ -922,4 +924,4 @@ subroutine DBEMT_End( u, p, x, OtherState, m, ErrStat, ErrMsg )
 
 END SUBROUTINE DBEMT_End
 
-end module DBEMT
\ No newline at end of file
+end module DBEMT