diff --git a/pySC/core/beam.py b/pySC/core/beam.py
index bc57b19..b13712e 100644
--- a/pySC/core/beam.py
+++ b/pySC/core/beam.py
@@ -13,7 +13,7 @@
 from pySC.core.simulated_commissioning import SimulatedCommissioning
 from pySC.core.constants import TRACK_ORB, TRACK_PORB, TRACK_TBT
 from pySC.utils.sc_tools import SCrandnc
-from pySC.utils.at_wrapper import atgetfieldvalues, atpass, findorbit6, findspos
+from pySC.utils.at_wrapper import atgetfieldvalues, atpass, findorbit6, findspos, patpass
 import warnings
 from pySC.utils import logging_tools
 
@@ -130,7 +130,7 @@ def beam_transmission(SC: SimulatedCommissioning, nParticles: int = None, nTurns
     if nTurns is None:
         nTurns = SC.INJ.nTurns
     LOGGER.debug(f'Calculating maximum beam transmission for {nParticles} particles and {nTurns} turns: ')
-    T = atpass(SC.RING, generate_bunches(SC, nParticles=nParticles), nTurns, np.array([len(SC.RING)]), keep_lattice=False)
+    T = patpass(SC.RING, generate_bunches(SC, nParticles=nParticles), nTurns, np.array([len(SC.RING)]), keep_lattice=False)
     fraction_survived = np.mean(~np.isnan(T[0, :, :, :]), axis=(0, 1))
     max_turns = np.sum(fraction_survived > 1 - SC.INJ.beamLostAt)
     if plot:
diff --git a/pySC/utils/at_wrapper.py b/pySC/utils/at_wrapper.py
index 46f3360..430ae18 100644
--- a/pySC/utils/at_wrapper.py
+++ b/pySC/utils/at_wrapper.py
@@ -26,6 +26,11 @@ def atpass(ring: Lattice, init_pos: ndarray, nturns: int, refpts: ndarray, keep_
                            keep_lattice=keep_lattice)
 
 
+def patpass(ring: Lattice, init_pos: ndarray, nturns: int, refpts: ndarray, keep_lattice: bool = False):
+    return at.patpass(lattice=ring.copy(), r_in=init_pos.copy(), nturns=nturns, refpts=refpts,
+                      keep_lattice=keep_lattice)
+
+
 def atgetfieldvalues(ring: Lattice, refpts: ndarray, attrname: str, index: int = None):
     return at.get_value_refpts(ring, refpts, attrname, index)
 
diff --git a/tests/test_at_wrapper.py b/tests/test_at_wrapper.py
index 209c0e2..0ee172c 100644
--- a/tests/test_at_wrapper.py
+++ b/tests/test_at_wrapper.py
@@ -5,7 +5,7 @@
 from numpy.testing import assert_equal
 import at
 from at import Lattice
-from pySC.utils.at_wrapper import findspos, atgetfieldvalues, atpass, findorbit6, findorbit4
+from pySC.utils.at_wrapper import findspos, atgetfieldvalues, atpass, patpass, findorbit6, findorbit4
 
 
 
@@ -37,6 +37,17 @@ def test_atpass(at_lattice):
     assert_equal(indices, np.arange(11, 450, 22, dtype=int))
 
 
+def test_patpass(at_lattice):
+    lattice_copy = copy.deepcopy(at_lattice)
+    indices = np.arange(11, 450, 22, dtype=int)
+    initial_pos = np.random.randn(6)
+    copy_initial_pos = copy.deepcopy(initial_pos)
+    tracking = patpass(at_lattice, initial_pos, 3, indices,)
+    assert tracking.shape == (6, 1, 20, 3)
+    assert_equal(initial_pos, copy_initial_pos)
+    assert at_lattice.__repr__() == lattice_copy.__repr__()
+    assert_equal(indices, np.arange(11, 450, 22, dtype=int))
+
 def test_findorbit6(at_lattice):
     lattice_copy = copy.deepcopy(at_lattice)
     indices = np.arange(11, 450, 22, dtype=int)