diff --git a/CHANGELOG.md b/CHANGELOG.md
index e0b3afe1..bff68d84 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Fixes
 
+- TC Scheduler Service 11: Add size and CRC check for contained TC.
 - Only delete health table entry in `HealthHelper` destructor if
   health table was set.
   PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/710/files
@@ -27,6 +28,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Added
 
+- `DleParser` helper class to parse DLE encoded packets from a byte stream.
+  PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/711
 - `UioMapper` is able to resolve symlinks now.
   PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/709
 - Add new `UnsignedByteField` class
diff --git a/src/fsfw/pus/Service11TelecommandScheduling.h b/src/fsfw/pus/Service11TelecommandScheduling.h
index aa958193..83b2b4c0 100644
--- a/src/fsfw/pus/Service11TelecommandScheduling.h
+++ b/src/fsfw/pus/Service11TelecommandScheduling.h
@@ -41,6 +41,8 @@ class Service11TelecommandScheduling final : public PusServiceBase {
   static constexpr ReturnValue_t INVALID_TIME_WINDOW = returnvalue::makeCode(CLASS_ID, 2);
   static constexpr ReturnValue_t TIMESHIFTING_NOT_POSSIBLE = returnvalue::makeCode(CLASS_ID, 3);
   static constexpr ReturnValue_t INVALID_RELATIVE_TIME = returnvalue::makeCode(CLASS_ID, 4);
+  static constexpr ReturnValue_t CONTAINED_TC_TOO_SMALL = returnvalue::makeCode(CLASS_ID, 5);
+  static constexpr ReturnValue_t CONTAINED_TC_CRC_MISSMATCH = returnvalue::makeCode(CLASS_ID, 6);
 
   static constexpr uint8_t SUBSYSTEM_ID = SUBSYSTEM_ID::PUS_SERVICE_11;
 
diff --git a/src/fsfw/pus/Service11TelecommandScheduling.tpp b/src/fsfw/pus/Service11TelecommandScheduling.tpp
index 47b0e5c8..962d84ac 100644
--- a/src/fsfw/pus/Service11TelecommandScheduling.tpp
+++ b/src/fsfw/pus/Service11TelecommandScheduling.tpp
@@ -6,6 +6,8 @@
 #include "fsfw/serialize/SerializeAdapter.h"
 #include "fsfw/serviceinterface.h"
 #include "fsfw/tmtcservices/AcceptsTelecommandsIF.h"
+#include "fsfw/tmtcpacket/pus/tc/PusTcIF.h"
+#include "fsfw/globalfunctions/CRC.h"
 
 static constexpr auto DEF_END = SerializeIF::Endianness::BIG;
 
@@ -171,6 +173,14 @@ inline ReturnValue_t Service11TelecommandScheduling<MAX_NUM_TCS>::doInsertActivi
     return returnvalue::FAILED;
   }
 
+  if (size < PusTcIF::MIN_SIZE) {
+    return CONTAINED_TC_TOO_SMALL;
+  }
+
+  if (CRC::crc16ccitt(data, size) != 0) {
+    return CONTAINED_TC_CRC_MISSMATCH;
+  }
+  
   // store currentPacket and receive the store address
   store_address_t addr{};
   if (tcStore->addData(&addr, data, size) != returnvalue::OK ||
diff --git a/src/fsfw/subsystem/SubsystemBase.cpp b/src/fsfw/subsystem/SubsystemBase.cpp
index d14e3539..7f215f60 100644
--- a/src/fsfw/subsystem/SubsystemBase.cpp
+++ b/src/fsfw/subsystem/SubsystemBase.cpp
@@ -195,7 +195,7 @@ ReturnValue_t SubsystemBase::checkTable(HybridIterator<ModeListEntry> tableIter)
     if (childrenMap.find(tableIter.value->getObject()) == childrenMap.end()) {
 #if FSFW_CPP_OSTREAM_ENABLED == 1
       using namespace std;
-      sif::warning << "SubsystemBase::checkTable: Could not find Object " << setfill('0') << hex
+      sif::warning << "SubsystemBase::checkTable: Could not find object " << setfill('0') << hex
                    << "0x" << setw(8) << tableIter.value->getObject() << " in object " << setw(8)
                    << setw(0) << "0x" << setw(8) << SystemObject::getObjectId() << dec << std::endl;
 #endif
diff --git a/src/fsfw/tmtcservices/SourceSequenceCounter.h b/src/fsfw/tmtcservices/SourceSequenceCounter.h
index 43b6945c..f530b444 100644
--- a/src/fsfw/tmtcservices/SourceSequenceCounter.h
+++ b/src/fsfw/tmtcservices/SourceSequenceCounter.h
@@ -11,7 +11,7 @@ class SourceSequenceCounter {
   SourceSequenceCounter(uint16_t initialSequenceCount = 0) : sequenceCount(initialSequenceCount) {}
   void increment() { sequenceCount = (sequenceCount + 1) % (ccsds::LIMIT_SEQUENCE_COUNT); }
   void decrement() { sequenceCount = (sequenceCount - 1) % (ccsds::LIMIT_SEQUENCE_COUNT); }
-  uint16_t get() { return this->sequenceCount; }
+  uint16_t get() const { return this->sequenceCount; }
   void reset(uint16_t toValue = 0) { sequenceCount = toValue % (ccsds::LIMIT_SEQUENCE_COUNT); }
   SourceSequenceCounter& operator++(int) {
     this->increment();
diff --git a/src/fsfw_hal/devicehandlers/MgmRM3100Handler.cpp b/src/fsfw_hal/devicehandlers/MgmRM3100Handler.cpp
index 707ca338..aa7c22d4 100644
--- a/src/fsfw_hal/devicehandlers/MgmRM3100Handler.cpp
+++ b/src/fsfw_hal/devicehandlers/MgmRM3100Handler.cpp
@@ -329,8 +329,8 @@ ReturnValue_t MgmRM3100Handler::handleDataReadout(const uint8_t *packet) {
 
   // Now scale to physical value in microtesla
   float fieldStrengthX = fieldStrengthRawX * scaleFactorX;
-  float fieldStrengthY = fieldStrengthRawY * scaleFactorX;
-  float fieldStrengthZ = fieldStrengthRawZ * scaleFactorX;
+  float fieldStrengthY = fieldStrengthRawY * scaleFactorY;
+  float fieldStrengthZ = fieldStrengthRawZ * scaleFactorZ;
 
   if (periodicPrintout) {
     if (debugDivider.checkAndIncrement()) {